Year 2 Length, mass, capacity and temperature: check-up and quiz

Method. Line up the start with the 0 mark or count from the start. Read the number at the other end.

1. Line up the 0 with the start. Put the 0 mark at the end of the thing.
   start at 0
2. Read the number at the other end. The other end is at 8 cm.
   end at 8 cm
3. Write the answer.
   8

Check. Count along the ruler from the start to the end: 8 centimetres. ✓

Watch out. Start at 0 is easiest. If the start is not 0, take the start away from the end.

Method. Each m is 100 cm. Multiply.

1. Know the rule. 1 m is the same as 100 cm.
   1 m = 100 cm
2. Multiply. Multiply the number of m by 100.
   5 × 100 = 500
3. Write the answer.
   500

Check. Share it back: 500 cm is 5 lots of 100 cm. ✓

Watch out. Multiply when you change to a smaller unit. There are 100 cm in 1 m.

Method. The object weighs the same as the weights. Add the weights together.

1. Look at the weights on the right. The weights balance the object on the left.
   200 g + 100 g
2. Change any kilograms to grams. 1 kg = 1000 g.
   200 + 100 = 300
3. Write the answer. The object weighs the same as the weights.
   300

Check. Add the weights again in a different order: 100 + 200 = 300. ✓

Watch out. Change kilograms to grams before you add. 1 kg = 1000 g.

Method. Look where the needle points, then read the number on the dial.

1. Find where the needle points. The needle points to a number on the dial.
   needle at 2
2. Read the number. The numbers on this dial are kilograms.
   2 kg
3. Write the answer.
   2

Check. The scale reads 2 kg. ✓

Watch out. The numbers on this dial go up by one kilogram each time.

Method. Find the top of the red line. Count up from the nearest numbered mark.

1. Find the top of the red liquid. The red line stops at this mark.
   top of the red line
2. Count from the nearest number. Each small mark is one degree.
   10 + 6 = 16
3. Write the answer.
   16

Check. Count the small marks from 10 up to the red line: 6. ✓

Watch out. Read the top of the red liquid, not the bottom of the bulb.

Method. Find the water line. Count up from the nearest numbered mark.

1. Find the top of the water. The water line shows the amount.
   top of the water
2. Count up from the nearest number. The small marks go up in 50 ml.
   400 + 50 = 450
3. Write the answer.
   450

Check. Count the marks from 400 to the water line: 50 ml more. ✓

Watch out. Read the mark at the water line. Each number is 200 ml apart, with a mark every 50 ml.

Method. Change to the same unit, then pick the smallest amount.

1. Look at A. A is 6 cm.
   A: 6 cm
2. Look at B. B is 9 cm.
   B: 9 cm
3. Pick the one with the smallest amount. Once the units match, the numbers can be compared.
   A wins
4. Write the answer.
   A

Check. Compare the other amounts too. ✓

Watch out. Read the units first. 2 m is longer than 150 cm, because 2 m = 200 cm.

Method. Change both amounts to the same unit. Then compare the numbers.

1. Write both amounts in the same unit. We compare them in g.
   1 kg = 1000 g
2. Compare the numbers. 1000 g is more than 900 g.
   1000 > 900
3. Write the sign. The sign shows which amount is bigger, or that they are equal.
   >

Check. Say it in words: 1000 g is more than 900 g. ✓

Watch out. Only compare amounts in the same unit. 1 m = 100 cm, 1 kg = 1000 g, 1 l = 1000 ml.

Method. Find the difference by taking the smaller amount away from the bigger one.

1. Find the bigger amount. The bigger temperature is 14 °C.
   14 °C
2. Find the smaller amount. The smaller temperature is 9 °C.
   9 °C
3. Take the smaller amount away. Subtract to find the difference.
   14 − 9 = 5
4. Write the answer.
   5

Check. Add the difference back: 9 + 5 = 14. ✓

Watch out. Start with the bigger number, then take the smaller one away.

Method. Change 1 litre to millilitres. Then compare with 500 ml.

1. Change 1 litre. 1 litre = 1000 ml.
   1 l = 1000 ml
2. Compare with 500 ml. Is 1000 ml less than 500 ml? No, it is more.
   1000 > 500
3. Decide. So Lin is not right.
   No

Check. 1000 ml is more than 500 ml. ✓

Watch out. 1 litre is more than 500 ml.

Method. Line up the start with the 0 mark or count from the start. Read the number at the other end.

1. Line up the 0 with the start. Put the 0 mark at the end of the thing.
   start at 0
2. Read the number at the other end. The other end is at 7 cm.
   end at 7 cm
3. Write the answer.
   7

Check. Count along the ruler from the start to the end: 7 centimetres. ✓

Watch out. Start at 0 is easiest. If the start is not 0, take the start away from the end.

Method. Think about the size of the thing before you choose the unit.

1. Think about how big it is. A bus is very long. Use the bigger unit.
   a bus
2. Choose the unit that fits. m is the right size for a bus.
   m
3. Write the answer.
   m

Check. Would another unit feel right? No. ✓

Watch out. Small things use small units. Big things use big units.

Method. Find the top of the red line. Count up from the nearest numbered mark.

1. Find the top of the red liquid. The red line stops at this mark.
   top of the red line
2. Count from the nearest number. Each small mark is one degree.
   20 + 6 = 26
3. Write the answer.
   26

Check. Count the small marks from 20 up to the red line: 6. ✓

Watch out. Read the top of the red liquid, not the bottom of the bulb.

Method. Each kg is 1000 g. Multiply.

1. Know the rule. 1 kg is the same as 1000 g.
   1 kg = 1000 g
2. Multiply. Multiply the number of kg by 1000.
   1 × 1000 = 1000
3. Write the answer.
   1000

Check. Share it back: 1000 g is 1 lots of 1000 g. ✓

Watch out. Multiply when you change to a smaller unit. There are 1000 g in 1 kg.

Method. Find the water line. Count up from the nearest numbered mark.

1. Find the top of the water. The water line shows the amount.
   top of the water
2. Count up from the nearest number. The small marks go up in 50 ml.
   300
3. Write the answer.
   300

Check. Count the marks from 300 to the water line: 0 ml more. ✓

Watch out. Read the mark at the water line. Each number is 200 ml apart, with a mark every 50 ml.

Method. Change to the same unit, then pick the biggest amount.

1. Look at A. A is 1500 g.
   A: 1500 g
2. Look at B. B is 1 kg.
   B: 1000 g
3. Pick the one with the biggest amount. Once the units match, the numbers can be compared.
   A wins
4. Write the answer.
   A

Check. Compare the other amounts too. ✓

Watch out. Read the units first. 2 m is longer than 150 cm, because 2 m = 200 cm.

Method. Change both amounts to the same unit. Then compare the numbers.

1. Write both amounts in the same unit. We compare them in cm.
   4 m = 400 cm
2. Compare the numbers. 400 cm is more than 350 cm.
   400 > 350
3. Write the sign. The sign shows which amount is bigger, or that they are equal.
   >

Check. Say it in words: 400 cm is more than 350 cm. ✓

Watch out. Only compare amounts in the same unit. 1 m = 100 cm, 1 kg = 1000 g, 1 l = 1000 ml.

Method. Look where the needle points, then read the number on the dial.

1. Find where the needle points. The needle points to a number on the dial.
   needle at 5
2. Read the number. The numbers on this dial are kilograms.
   5 kg
3. Write the answer.
   5

Check. The scale reads 5 kg. ✓

Watch out. The numbers on this dial go up by one kilogram each time.

Method. Find the difference by taking the smaller amount away from the bigger one.

1. Find the bigger amount. The bigger rope is 300 cm.
   300 cm
2. Find the smaller amount. The smaller rope is 80 cm.
   80 cm
3. Take the smaller amount away. Subtract to find the difference.
   300 − 80 = 220
4. Write the answer.
   220

Check. Add the difference back: 80 + 220 = 300. ✓

Watch out. Start with the bigger number, then take the smaller one away.

Method. Change to the same unit, then pick the biggest amount.

1. Look at Ruby. Ruby is 250 ml.
   Ruby: 250 ml
2. Look at Lin. Lin is 600 ml.
   Lin: 600 ml
3. Pick the one with the biggest amount. Once the units match, the numbers can be compared.
   Lin wins
4. Write the answer.
   Lin

Check. Compare the other amounts too. ✓

Watch out. Read the units first. 2 m is longer than 150 cm, because 2 m = 200 cm.