Year 4: Changing units: km, m, cm, mm, kg, g, l and ml

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Multiply by 100. Each m is 100 cm. So 4 m is 4 lots of 100 cm. (Multiplying by 100 moves every digit 2 places to the left.)
   4 × 100 = 400
3. Write the answer with its unit. A measure always needs its unit.
   4 m = 400 cm

Check. Go back: 400 ÷ 100 = 4. ✓

Watch out. Changing to a smaller unit gives a bigger number: 4 m is 400 cm, not 0.04.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Multiply by 100. Each m is 100 cm. So 9 m is 9 lots of 100 cm. (Multiplying by 100 moves every digit 2 places to the left.)
   9 × 100 = 900
3. Write the answer with its unit. A measure always needs its unit.
   9 m = 900 cm

Check. Go back: 900 ÷ 100 = 9. ✓

Watch out. Changing to a smaller unit gives a bigger number: 9 m is 900 cm, not 0.09.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Multiply by 100. Each m is 100 cm. So 12 m is 12 lots of 100 cm. (Multiplying by 100 moves every digit 2 places to the left.)
   12 × 100 = 1,200
3. Write the answer with its unit. A measure always needs its unit.
   12 m = 1,200 cm

Check. Go back: 1,200 ÷ 100 = 12. ✓

Watch out. Changing to a smaller unit gives a bigger number: 12 m is 1,200 cm, not 0.12.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Multiply by 100. Each m is 100 cm. So 30 m is 30 lots of 100 cm. (Multiplying by 100 moves every digit 2 places to the left.)
   30 × 100 = 3,000
3. Write the answer with its unit. A measure always needs its unit.
   30 m = 3,000 cm

Check. Go back: 3,000 ÷ 100 = 30. ✓

Watch out. Changing to a smaller unit gives a bigger number: 30 m is 3,000 cm, not 0.3.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 grams in 1 kilogram, so multiply by 1,000 to change kilograms to grams.

1. Remember the fact. 1 kg is the same as 1,000 g. A gram is a much smaller unit, so we will have a bigger number.
   1 kg = 1,000 g
2. Multiply by 1,000. Each kg is 1,000 g. So 3 kg is 3 lots of 1,000 g. (Multiplying by 1,000 moves every digit 3 places to the left.)
   3 × 1,000 = 3,000
3. Write the answer with its unit. A measure always needs its unit.
   3 kg = 3,000 g

Check. Go back: 3,000 ÷ 1,000 = 3. ✓

Watch out. Changing to a smaller unit gives a bigger number: 3 kg is 3,000 g, not 0.003.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 grams in 1 kilogram, so multiply by 1,000 to change kilograms to grams.

1. Remember the fact. 1 kg is the same as 1,000 g. A gram is a much smaller unit, so we will have a bigger number.
   1 kg = 1,000 g
2. Multiply by 1,000. Each kg is 1,000 g. So 8 kg is 8 lots of 1,000 g. (Multiplying by 1,000 moves every digit 3 places to the left.)
   8 × 1,000 = 8,000
3. Write the answer with its unit. A measure always needs its unit.
   8 kg = 8,000 g

Check. Go back: 8,000 ÷ 1,000 = 8. ✓

Watch out. Changing to a smaller unit gives a bigger number: 8 kg is 8,000 g, not 0.008.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so multiply by 1,000 to change litres to millilitres.

1. Remember the fact. 1 l is the same as 1,000 ml. A millilitre is a much smaller unit, so we will have a bigger number.
   1 l = 1,000 ml
2. Multiply by 1,000. Each l is 1,000 ml. So 5 l is 5 lots of 1,000 ml. (Multiplying by 1,000 moves every digit 3 places to the left.)
   5 × 1,000 = 5,000
3. Write the answer with its unit. A measure always needs its unit.
   5 l = 5,000 ml

Check. Go back: 5,000 ÷ 1,000 = 5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 5 l is 5,000 ml, not 0.005.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so multiply by 1,000 to change litres to millilitres.

1. Remember the fact. 1 l is the same as 1,000 ml. A millilitre is a much smaller unit, so we will have a bigger number.
   1 l = 1,000 ml
2. Multiply by 1,000. Each l is 1,000 ml. So 12 l is 12 lots of 1,000 ml. (Multiplying by 1,000 moves every digit 3 places to the left.)
   12 × 1,000 = 12,000
3. Write the answer with its unit. A measure always needs its unit.
   12 l = 12,000 ml

Check. Go back: 12,000 ÷ 1,000 = 12. ✓

Watch out. Changing to a smaller unit gives a bigger number: 12 l is 12,000 ml, not 0.012.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so multiply by 1,000 to change kilometres to metres.

1. Remember the fact. 1 km is the same as 1,000 m. A metre is a much smaller unit, so we will have a bigger number.
   1 km = 1,000 m
2. Multiply by 1,000. Each km is 1,000 m. So 6 km is 6 lots of 1,000 m. (Multiplying by 1,000 moves every digit 3 places to the left.)
   6 × 1,000 = 6,000
3. Write the answer with its unit. A measure always needs its unit.
   6 km = 6,000 m

Check. Go back: 6,000 ÷ 1,000 = 6. ✓

Watch out. Changing to a smaller unit gives a bigger number: 6 km is 6,000 m, not 0.006.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so multiply by 1,000 to change kilometres to metres.

1. Remember the fact. 1 km is the same as 1,000 m. A metre is a much smaller unit, so we will have a bigger number.
   1 km = 1,000 m
2. Multiply by 1,000. Each km is 1,000 m. So 20 km is 20 lots of 1,000 m. (Multiplying by 1,000 moves every digit 3 places to the left.)
   20 × 1,000 = 20,000
3. Write the answer with its unit. A measure always needs its unit.
   20 km = 20,000 m

Check. Go back: 20,000 ÷ 1,000 = 20. ✓

Watch out. Changing to a smaller unit gives a bigger number: 20 km is 20,000 m, not 0.02.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 10 millimetres in 1 centimetre, so multiply by 10 to change centimetres to millimetres.

1. Remember the fact. 1 cm is the same as 10 mm. A millimetre is a much smaller unit, so we will have a bigger number.
   1 cm = 10 mm
2. Multiply by 10. Each cm is 10 mm. So 5 cm is 5 lots of 10 mm. (Multiplying by 10 moves every digit 1 place to the left.)
   5 × 10 = 50
3. Write the answer with its unit. A measure always needs its unit.
   5 cm = 50 mm

Check. Go back: 50 ÷ 10 = 5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 5 cm is 50 mm, not 0.5.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 10 millimetres in 1 centimetre, so multiply by 10 to change centimetres to millimetres.

1. Remember the fact. 1 cm is the same as 10 mm. A millimetre is a much smaller unit, so we will have a bigger number.
   1 cm = 10 mm
2. Multiply by 10. Each cm is 10 mm. So 18 cm is 18 lots of 10 mm. (Multiplying by 10 moves every digit 1 place to the left.)
   18 × 10 = 180
3. Write the answer with its unit. A measure always needs its unit.
   18 cm = 180 mm

Check. Go back: 180 ÷ 10 = 18. ✓

Watch out. Changing to a smaller unit gives a bigger number: 18 cm is 180 mm, not 1.8.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 10 millimetres in 1 centimetre, so multiply by 10 to change centimetres to millimetres.

1. Remember the fact. 1 cm is the same as 10 mm. A millimetre is a much smaller unit, so we will have a bigger number.
   1 cm = 10 mm
2. Multiply by 10. Each cm is 10 mm. So 40 cm is 40 lots of 10 mm. (Multiplying by 10 moves every digit 1 place to the left.)
   40 × 10 = 400
3. Write the answer with its unit. A measure always needs its unit.
   40 cm = 400 mm

Check. Go back: 400 ÷ 10 = 40. ✓

Watch out. Changing to a smaller unit gives a bigger number: 40 cm is 400 mm, not 4.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so divide by 100 to change centimetres to metres.

1. Remember the fact. 1 m is the same as 100 cm. A metre is a much bigger unit, so we will have a smaller number.
   100 cm = 1 m
2. Divide by 100. Every 100 cm make 1 m. We find how many lots of 100 there are.
   700 ÷ 100 = 7
3. Write the answer with its unit. A measure always needs its unit.
   700 cm = 7 m

Check. Go back: 7 × 100 = 700. ✓

Watch out. Changing to a bigger unit gives a smaller number. 700 cm is 7 m, not 70,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 grams in 1 kilogram, so divide by 1,000 to change grams to kilograms.

1. Remember the fact. 1 kg is the same as 1,000 g. A kilogram is a much bigger unit, so we will have a smaller number.
   1,000 g = 1 kg
2. Divide by 1,000. Every 1,000 g make 1 kg. We find how many lots of 1,000 there are.
   4,000 ÷ 1,000 = 4
3. Write the answer with its unit. A measure always needs its unit.
   4,000 g = 4 kg

Check. Go back: 4 × 1,000 = 4,000. ✓

Watch out. Changing to a bigger unit gives a smaller number. 4,000 g is 4 kg, not 4,000,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so divide by 1,000 to change millilitres to litres.

1. Remember the fact. 1 l is the same as 1,000 ml. A litre is a much bigger unit, so we will have a smaller number.
   1,000 ml = 1 l
2. Divide by 1,000. Every 1,000 ml make 1 l. We find how many lots of 1,000 there are.
   9,000 ÷ 1,000 = 9
3. Write the answer with its unit. A measure always needs its unit.
   9,000 ml = 9 l

Check. Go back: 9 × 1,000 = 9,000. ✓

Watch out. Changing to a bigger unit gives a smaller number. 9,000 ml is 9 l, not 9,000,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so divide by 1,000 to change metres to kilometres.

1. Remember the fact. 1 km is the same as 1,000 m. A kilometre is a much bigger unit, so we will have a smaller number.
   1,000 m = 1 km
2. Divide by 1,000. Every 1,000 m make 1 km. We find how many lots of 1,000 there are.
   5,000 ÷ 1,000 = 5
3. Write the answer with its unit. A measure always needs its unit.
   5,000 m = 5 km

Check. Go back: 5 × 1,000 = 5,000. ✓

Watch out. Changing to a bigger unit gives a smaller number. 5,000 m is 5 km, not 5,000,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so divide by 100 to change centimetres to metres.

1. Remember the fact. 1 m is the same as 100 cm. A metre is a much bigger unit, so we will have a smaller number.
   100 cm = 1 m
2. Divide by 100. Every 100 cm make 1 m. We find how many lots of 100 there are.
   600 ÷ 100 = 6
3. Write the answer with its unit. A measure always needs its unit.
   600 cm = 6 m

Check. Go back: 6 × 100 = 600. ✓

Watch out. Changing to a bigger unit gives a smaller number. 600 cm is 6 m, not 60,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 10 millimetres in 1 centimetre, so divide by 10 to change millimetres to centimetres.

1. Remember the fact. 1 cm is the same as 10 mm. A centimetre is a much bigger unit, so we will have a smaller number.
   10 mm = 1 cm
2. Divide by 10. Every 10 mm make 1 cm. We find how many lots of 10 there are.
   90 ÷ 10 = 9
3. Write the answer with its unit. A measure always needs its unit.
   90 mm = 9 cm

Check. Go back: 9 × 10 = 90. ✓

Watch out. Changing to a bigger unit gives a smaller number. 90 mm is 9 cm, not 900.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so multiply by 1,000 to change kilometres to metres.

1. Remember the fact. 1 km is the same as 1,000 m. A metre is a much smaller unit, so we will have a bigger number.
   1 km = 1,000 m
2. Split the number into whole kilometres and a part. It is easier to change the whole kilometres and the part separately.
   1.5 km = 1 km + 0.5 km
3. Change the whole kilometres. Multiply by 1,000.
   1 × 1,000 = 1,000 m
4. Change the part. Think about what fraction of a km it is.
   0.5 km is half of 1 km. Half of 1,000 = 500 m
5. Add the two answers together.
   1,000 + 500 = 1,500 m

Check. Go back: 1,500 ÷ 1,000 = 1.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 1.5 km is 1,500 m, not 0.0015.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 grams in 1 kilogram, so multiply by 1,000 to change kilograms to grams.

1. Remember the fact. 1 kg is the same as 1,000 g. A gram is a much smaller unit, so we will have a bigger number.
   1 kg = 1,000 g
2. Split the number into whole kilograms and a part. It is easier to change the whole kilograms and the part separately.
   2.5 kg = 2 kg + 0.5 kg
3. Change the whole kilograms. Multiply by 1,000.
   2 × 1,000 = 2,000 g
4. Change the part. Think about what fraction of a kg it is.
   0.5 kg is half of 1 kg. Half of 1,000 = 500 g
5. Add the two answers together.
   2,000 + 500 = 2,500 g

Check. Go back: 2,500 ÷ 1,000 = 2.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 2.5 kg is 2,500 g, not 0.0025.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so multiply by 1,000 to change litres to millilitres.

1. Remember the fact. 1 l is the same as 1,000 ml. A millilitre is a much smaller unit, so we will have a bigger number.
   1 l = 1,000 ml
2. Split the number into whole litres and a part. It is easier to change the whole litres and the part separately.
   0.5 l is just a part of 1 l.
3. Change the part. Think about what fraction of a l it is.
   0.5 l is half of 1 l. Half of 1,000 = 500 ml
   So 0.5 l = 500 ml

Check. Go back: 500 ÷ 1,000 = 0.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 0.5 l is 500 ml, not 0.0005.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Split the number into whole metres and a part. It is easier to change the whole metres and the part separately.
   3.5 m = 3 m + 0.5 m
3. Change the whole metres. Multiply by 100.
   3 × 100 = 300 cm
4. Change the part. Think about what fraction of a m it is.
   0.5 m is half of 1 m. Half of 100 = 50 cm
5. Add the two answers together.
   300 + 50 = 350 cm

Check. Go back: 350 ÷ 100 = 3.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 3.5 m is 350 cm, not 0.035.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so multiply by 1,000 to change litres to millilitres.

1. Remember the fact. 1 l is the same as 1,000 ml. A millilitre is a much smaller unit, so we will have a bigger number.
   1 l = 1,000 ml
2. Split the number into whole litres and a part. It is easier to change the whole litres and the part separately.
   0.25 l is just a part of 1 l.
3. Change the part. Think about what fraction of a l it is.
   0.25 l is a quarter of 1 l. 1,000 ÷ 4 = 250 ml
   So 0.25 l = 250 ml

Check. Go back: 250 ÷ 1,000 = 0.25. ✓

Watch out. Changing to a smaller unit gives a bigger number: 0.25 l is 250 ml, not 0.00025.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Split the number into whole metres and a part. It is easier to change the whole metres and the part separately.
   1.75 m = 1 m + 0.75 m
3. Change the whole metres. Multiply by 100.
   1 × 100 = 100 cm
4. Change the part. Think about what fraction of a m it is.
   0.75 m is three quarters of 1 m. 100 ÷ 4 = 25, then 25 × 3 = 75 cm
5. Add the two answers together.
   100 + 75 = 175 cm

Check. Go back: 175 ÷ 100 = 1.75. ✓

Watch out. Changing to a smaller unit gives a bigger number: 1.75 m is 175 cm, not 0.0175.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so divide by 100 to change centimetres to metres.

1. Remember the fact. 1 m is the same as 100 cm. A metre is a much bigger unit, so we will have a smaller number.
   100 cm = 1 m
2. Divide by 100 and keep the remainder. The whole metres come from the lots of 100 cm. The remainder is the part left over.
   250 ÷ 100 = 2 remainder 50
3. Write the remainder as a part of 1 m. 50 cm out of 100 cm is 50/100 of a m.
   50 cm is half of 100 cm, so 50 cm = 0.5 m
4. Put the whole metres and the part together. The whole number goes before the decimal point.
   2 + 0.5 = 2.5 m

Check. Go back: 2.5 × 100 = 250. ✓

Watch out. Changing to a bigger unit gives a smaller number. 250 cm is 2.5 m, not 25,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 grams in 1 kilogram, so divide by 1,000 to change grams to kilograms.

1. Remember the fact. 1 kg is the same as 1,000 g. A kilogram is a much bigger unit, so we will have a smaller number.
   1,000 g = 1 kg
2. Divide by 1,000 and keep the remainder. The whole kilograms come from the lots of 1,000 g. The remainder is the part left over.
   1,500 ÷ 1,000 = 1 remainder 500
3. Write the remainder as a part of 1 kg. 500 g out of 1,000 g is 500/1,000 of a kg.
   500 g is half of 1,000 g, so 500 g = 0.5 kg
4. Put the whole kilograms and the part together. The whole number goes before the decimal point.
   1 + 0.5 = 1.5 kg

Check. Go back: 1.5 × 1,000 = 1,500. ✓

Watch out. Changing to a bigger unit gives a smaller number. 1,500 g is 1.5 kg, not 1,500,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 millilitres in 1 litre, so divide by 1,000 to change millilitres to litres.

1. Remember the fact. 1 l is the same as 1,000 ml. A litre is a much bigger unit, so we will have a smaller number.
   1,000 ml = 1 l
2. Compare with 1 l. 750 ml is less than 1,000 ml, so there is no whole l. It is just a part of a l.
   750 ml out of 1,000 ml
3. Write the amount as a part of 1 l. 750 ml out of 1,000 ml is 750/1,000 of a l.
   750 ml is three quarters of 1,000 ml, so 750 ml = 0.75 l
4. Write the answer.
   0.75 l

Check. Go back: 0.75 × 1,000 = 750. ✓

Watch out. Changing to a bigger unit gives a smaller number. 750 ml is 0.75 l, not 750,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so divide by 1,000 to change metres to kilometres.

1. Remember the fact. 1 km is the same as 1,000 m. A kilometre is a much bigger unit, so we will have a smaller number.
   1,000 m = 1 km
2. Divide by 1,000 and keep the remainder. The whole kilometres come from the lots of 1,000 m. The remainder is the part left over.
   4,500 ÷ 1,000 = 4 remainder 500
3. Write the remainder as a part of 1 km. 500 m out of 1,000 m is 500/1,000 of a km.
   500 m is half of 1,000 m, so 500 m = 0.5 km
4. Put the whole kilometres and the part together. The whole number goes before the decimal point.
   4 + 0.5 = 4.5 km

Check. Go back: 4.5 × 1,000 = 4,500. ✓

Watch out. Changing to a bigger unit gives a smaller number. 4,500 m is 4.5 km, not 4,500,000.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 10 millimetres in 1 centimetre, so divide by 10 to change millimetres to centimetres.

1. Remember the fact. 1 cm is the same as 10 mm. A centimetre is a much bigger unit, so we will have a smaller number.
   10 mm = 1 cm
2. Divide by 10 and keep the remainder. The whole centimetres come from the lots of 10 mm. The remainder is the part left over.
   35 ÷ 10 = 3 remainder 5
3. Write the remainder as a part of 1 cm. 5 mm out of 10 mm is 5/10 of a cm.
   5 mm is half of 10 mm, so 5 mm = 0.5 cm
4. Put the whole centimetres and the part together. The whole number goes before the decimal point.
   3 + 0.5 = 3.5 cm

Check. Go back: 3.5 × 10 = 35. ✓

Watch out. Changing to a bigger unit gives a smaller number. 35 mm is 3.5 cm, not 350.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so divide by 100 to change centimetres to metres.

1. Remember the fact. 1 m is the same as 100 cm. A metre is a much bigger unit, so we will have a smaller number.
   100 cm = 1 m
2. Divide by 100 and keep the remainder. The whole metres come from the lots of 100 cm. The remainder is the part left over.
   125 ÷ 100 = 1 remainder 25
3. Write the remainder as a part of 1 m. 25 cm out of 100 cm is 25/100 of a m.
   25 cm is a quarter of 100 cm, so 25 cm = 0.25 m
4. Put the whole metres and the part together. The whole number goes before the decimal point.
   1 + 0.25 = 1.25 m

Check. Go back: 1.25 × 100 = 125. ✓

Watch out. Changing to a bigger unit gives a smaller number. 125 cm is 1.25 m, not 12,500.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Change the metres to centimetres, then add the centimetres that are left over.

1. Change the whole metres to cm. 1 m = 100 cm, so multiply by 100.
   3 × 100 = 300 cm
2. Add the extra cm. Put the two parts together.
   300 + 40 = 340 cm
3. Write the answer. Use the small unit only.
   3 m 40 cm = 340 cm

Check. 340 ÷ 100 = 3 remainder 40. ✓

Watch out. Change the metres first. 3 m is 300 cm, not 3 cm. Then add the 40 cm.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Change the kilograms to grams, then add the grams that are left over.

1. Change the whole kilograms to g. 1 kg = 1,000 g, so multiply by 1,000.
   2 × 1,000 = 2,000 g
2. Add the extra g. Put the two parts together.
   2,000 + 350 = 2,350 g
3. Write the answer. Use the small unit only.
   2 kg 350 g = 2,350 g

Check. 2,350 ÷ 1,000 = 2 remainder 350. ✓

Watch out. Change the kilograms first. 2 kg is 2,000 g, not 2 g. Then add the 350 g.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Change the litres to millilitres, then add the millilitres that are left over.

1. Change the whole litres to ml. 1 l = 1,000 ml, so multiply by 1,000.
   5 × 1,000 = 5,000 ml
2. Add the extra ml. Put the two parts together.
   5,000 + 200 = 5,200 ml
3. Write the answer. Use the small unit only.
   5 l 200 ml = 5,200 ml

Check. 5,200 ÷ 1,000 = 5 remainder 200. ✓

Watch out. Change the litres first. 5 l is 5,000 ml, not 5 ml. Then add the 200 ml.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Change the kilometres to metres, then add the metres that are left over.

1. Change the whole kilometres to m. 1 km = 1,000 m, so multiply by 1,000.
   1 × 1,000 = 1,000 m
2. Add the extra m. Put the two parts together.
   1,000 + 750 = 1,750 m
3. Write the answer. Use the small unit only.
   1 km 750 m = 1,750 m

Check. 1,750 ÷ 1,000 = 1 remainder 750. ✓

Watch out. Change the kilometres first. 1 km is 1,000 m, not 1 m. Then add the 750 m.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Divide by 100 to find the whole metres. The remainder is the centimetres that are left over.

1. Divide by 100. Every 100 cm make 1 m.
   275 ÷ 100 = 2 remainder 75
2. Say what the answer means. The whole number is the metres. The remainder is the centimetres left over.
   2 m and 75 cm
3. Write the answer. Put the big unit first, then the small unit.
   275 cm = 2 m 75 cm

Check. 2 × 100 + 75 = 275. ✓

Watch out. The remainder is not a decimal. It is the part left over, written in the smaller unit.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Divide by 1,000 to find the whole kilograms. The remainder is the grams that are left over.

1. Divide by 1,000. Every 1,000 g make 1 kg.
   1,450 ÷ 1,000 = 1 remainder 450
2. Say what the answer means. The whole number is the kilograms. The remainder is the grams left over.
   1 kg and 450 g
3. Write the answer. Put the big unit first, then the small unit.
   1,450 g = 1 kg 450 g

Check. 1 × 1,000 + 450 = 1,450. ✓

Watch out. The remainder is not a decimal. It is the part left over, written in the smaller unit.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Divide by 1,000 to find the whole litres. The remainder is the millilitres that are left over.

1. Divide by 1,000. Every 1,000 ml make 1 l.
   3,600 ÷ 1,000 = 3 remainder 600
2. Say what the answer means. The whole number is the litres. The remainder is the millilitres left over.
   3 l and 600 ml
3. Write the answer. Put the big unit first, then the small unit.
   3,600 ml = 3 l 600 ml

Check. 3 × 1,000 + 600 = 3,600. ✓

Watch out. The remainder is not a decimal. It is the part left over, written in the smaller unit.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. Divide by 1,000 to find the whole kilometres. The remainder is the metres that are left over.

1. Divide by 1,000. Every 1,000 m make 1 km.
   2,300 ÷ 1,000 = 2 remainder 300
2. Say what the answer means. The whole number is the kilometres. The remainder is the metres left over.
   2 km and 300 m
3. Write the answer. Put the big unit first, then the small unit.
   2,300 m = 2 km 300 m

Check. 2 × 1,000 + 300 = 2,300. ✓

Watch out. The remainder is not a decimal. It is the part left over, written in the smaller unit.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 100 centimetres in 1 metre, so multiply by 100 to change metres to centimetres.

1. Remember the fact. 1 m is the same as 100 cm. A centimetre is a much smaller unit, so we will have a bigger number.
   1 m = 100 cm
2. Split the number into whole metres and a part. It is easier to change the whole metres and the part separately.
   1.5 m = 1 m + 0.5 m
3. Change the whole metres. Multiply by 100.
   1 × 100 = 100 cm
4. Change the part. Think about what fraction of a m it is.
   0.5 m is half of 1 m. Half of 100 = 50 cm
5. Add the two answers together.
   100 + 50 = 150 cm

Check. Go back: 150 ÷ 100 = 1.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 1.5 m is 150 cm, not 0.015.

Key words. To convert is to change a measure from one unit to another unit. Kilo means 1000: 1 kilometre = 1000 m, 1 kilogram = 1000 g. Centi means a hundredth: 1 m = 100 cm. Milli means a thousandth.

Method. There are 1,000 metres in 1 kilometre, so multiply by 1,000 to change kilometres to metres.

1. Remember the fact. 1 km is the same as 1,000 m. A metre is a much smaller unit, so we will have a bigger number.
   1 km = 1,000 m
2. Split the number into whole kilometres and a part. It is easier to change the whole kilometres and the part separately.
   2.5 km = 2 km + 0.5 km
3. Change the whole kilometres. Multiply by 1,000.
   2 × 1,000 = 2,000 m
4. Change the part. Think about what fraction of a km it is.
   0.5 km is half of 1 km. Half of 1,000 = 500 m
5. Add the two answers together.
   2,000 + 500 = 2,500 m

Check. Go back: 2,500 ÷ 1,000 = 2.5. ✓

Watch out. Changing to a smaller unit gives a bigger number: 2.5 km is 2,500 m, not 0.0025.