Step-by-step Maths Level 5: Converting length: km, m, cm and mm

Method. Divide by 100 to find the whole m; the remainder is the cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Share 1,888 cm into groups of 100. Each group is one m.
   1,888 ÷ 100 = 18 r 88
3. Write the answer. 18 whole m and the cm left over.
   18 m 88 cm

Check. Check: 18 × 100 + 88 = 1,888.

Watch out. Use a space between the two parts, and the unit after each: 18 m 88 cm.

Method. Divide by 10 to find the whole cm; the remainder is the mm.

1. Use the rule. 1 cm is 10 mm.
   1 cm = 10 mm
2. Share 32 mm into groups of 10. Each group is one cm.
   32 ÷ 10 = 3 r 2
3. Write the answer. 3 whole cm and the mm left over.
   3 cm 2 mm

Check. Check: 3 × 10 + 2 = 32.

Watch out. Use a space between the two parts, and the unit after each: 3 cm 2 mm.

Method. Divide by 100 to find the whole m; the remainder is the cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Share 1,253 cm into groups of 100. Each group is one m.
   1,253 ÷ 100 = 12 r 53
3. Write the answer. 12 whole m and the cm left over.
   12 m 53 cm

Check. Check: 12 × 100 + 53 = 1,253.

Watch out. Use a space between the two parts, and the unit after each: 12 m 53 cm.

Method. Multiply by 1,000 to change kilometres into metres.

1. Use the rule. 1 kilometre is 1,000 metres.
   1 km = 1,000 m
2. Multiply the kilometres by 1,000. Each kilometre is 1,000 metres.
   14 × 1,000 = 14,000
3. Write the answer with the unit. The unit is metres.
   14,000 m

Check. Check: 14,000 ÷ 1,000 = 14.

Watch out. Going to a smaller unit makes the number bigger. Multiply.

Method. Multiply by 1,000 to change kilometres into metres.

1. Use the rule. 1 kilometre is 1,000 metres.
   1 km = 1,000 m
2. Multiply the kilometres by 1,000. Each kilometre is 1,000 metres.
   2 × 1,000 = 2,000
3. Write the answer with the unit. The unit is metres.
   2,000 m

Check. Check: 2,000 ÷ 1,000 = 2.

Watch out. Going to a smaller unit makes the number bigger. Multiply.

Method. Multiply by 100 to change m into cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Multiply the m by 100. Each m has 100 cm.
   8 × 100 = 800
3. Write the answer with the unit. The unit is cm.
   800 cm

Check. Check: 800 ÷ 100 = 8.

Watch out. A smaller unit gives a bigger number. Multiply by 100.

Method. Multiply by 100 to change m into cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Multiply the m by 100. Each m has 100 cm.
   9 × 100 = 900
3. Write the answer with the unit. The unit is cm.
   900 cm

Check. Check: 900 ÷ 100 = 9.

Watch out. A smaller unit gives a bigger number. Multiply by 100.

Method. Divide by 100 to find the whole m; the remainder is the cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Share 981 cm into groups of 100. Each group is one m.
   981 ÷ 100 = 9 r 81
3. Write the answer. 9 whole m and the cm left over.
   9 m 81 cm

Check. Check: 9 × 100 + 81 = 981.

Watch out. Use a space between the two parts, and the unit after each: 9 m 81 cm.

Method. Multiply by 10 to change cm into mm.

1. Use the rule. 1 cm is 10 mm.
   1 cm = 10 mm
2. Multiply the cm by 10. Each cm has 10 mm.
   5 × 10 = 50
3. Write the answer with the unit. The unit is mm.
   50 mm

Check. Check: 50 ÷ 10 = 5.

Watch out. A smaller unit gives a bigger number. Multiply by 10.

Method. Multiply by 10 to change cm into mm.

1. Use the rule. 1 cm is 10 mm.
   1 cm = 10 mm
2. Multiply the cm by 10. Each cm has 10 mm.
   4 × 10 = 40
3. Write the answer with the unit. The unit is mm.
   40 mm

Check. Check: 40 ÷ 10 = 4.

Watch out. A smaller unit gives a bigger number. Multiply by 10.

Method. Divide by 100 to find the whole m; the remainder is the cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Share 1,127 cm into groups of 100. Each group is one m.
   1,127 ÷ 100 = 11 r 27
3. Write the answer. 11 whole m and the cm left over.
   11 m 27 cm

Check. Check: 11 × 100 + 27 = 1,127.

Watch out. Use a space between the two parts, and the unit after each: 11 m 27 cm.

Method. Multiply by 10 to change cm into mm.

1. Use the rule. 1 cm is 10 mm.
   1 cm = 10 mm
2. Multiply the cm by 10. Each cm has 10 mm.
   8 × 10 = 80
3. Write the answer with the unit. The unit is mm.
   80 mm

Check. Check: 80 ÷ 10 = 8.

Watch out. A smaller unit gives a bigger number. Multiply by 10.

Method. Divide by 100 to find the whole m; the remainder is the cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Share 1,086 cm into groups of 100. Each group is one m.
   1,086 ÷ 100 = 10 r 86
3. Write the answer. 10 whole m and the cm left over.
   10 m 86 cm

Check. Check: 10 × 100 + 86 = 1,086.

Watch out. Use a space between the two parts, and the unit after each: 10 m 86 cm.

Method. Divide by 10 to find the whole cm; the remainder is the mm.

1. Use the rule. 1 cm is 10 mm.
   1 cm = 10 mm
2. Share 111 mm into groups of 10. Each group is one cm.
   111 ÷ 10 = 11 r 1
3. Write the answer. 11 whole cm and the mm left over.
   11 cm 1 mm

Check. Check: 11 × 10 + 1 = 111.

Watch out. Use a space between the two parts, and the unit after each: 11 cm 1 mm.

Method. Multiply by 100 to change m into cm.

1. Use the rule. 1 m is 100 cm.
   1 m = 100 cm
2. Multiply the m by 100. Each m has 100 cm.
   17 × 100 = 1,700
3. Write the answer with the unit. The unit is cm.
   1,700 cm

Check. Check: 1,700 ÷ 100 = 17.

Watch out. A smaller unit gives a bigger number. Multiply by 100.

Method. Multiply by 1,000 to change kilometres into metres.

1. Use the rule. 1 kilometre is 1,000 metres.
   1 km = 1,000 m
2. Multiply the kilometres by 1,000. Each kilometre is 1,000 metres.
   3 × 1,000 = 3,000
3. Write the answer with the unit. The unit is metres.
   3,000 m

Check. Check: 3,000 ÷ 1,000 = 3.

Watch out. Going to a smaller unit makes the number bigger. Multiply.