Measures and time · Ages 8–9

Millimetres worksheet

Part of: Kilometres and millimetres

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Measures and time · Ages 8–9

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Name:Date:Score:／48

Write each answer in the space. For word problems, show your working and write a sentence answer.

1.The strip's left end is at 0. How long is the strip, in millimetres?
Answer:
2.The strip's left end is at 1 cm. How long is the strip, in millimetres?
Answer:
3.15 cm 6 mm = mm
Answer:
4.158 mm = cm mm
Fill in each blank
Answer:
5.The strip's left end is at 2 cm. How long is the strip, in millimetres?
Answer:
6.19 cm 6 mm = mm
Answer:
7.4 mm + 4 cm 2 mm = mm
Answer:
8.7 mm + 4 cm 7 mm = mm
Answer:

13.Tsz-hin's pencil is 17 cm 8 mm long. After some sharpening it is 23 mm shorter. How long is it now, in millimetres?
Working:
Answer:
14.A red ribbon is 13 cm 6 mm long and a blue one is 51 mm. How many millimetres longer is the longer one?
Working:
Answer:
15.A book is 9 mm thick. A pile of 10 of them is mm high, which is cm.
Fill in each blank
Working:
Answer:
16.A book is 8 mm thick. A pile of 25 of them is mm high, which is cm.
Fill in each blank
Working:
Answer:
17.Chi-keung's pencil is 11 cm 4 mm long. After some sharpening it is 6 mm shorter. How long is it now, in millimetres?
Working:
Answer:
18.A red ribbon is 10 cm 2 mm long and a blue one is 150 mm. How many millimetres longer is the longer one?
Working:
Answer:

Show the answers and working

Millimetres worksheet: Answers and working

1. 39 mm
See which whole centimetre the right end has passed, then count the small steps — each is 1 mm.
Read the whole centimetres, then count the small steps, 1 mm each: 39 mm.
2. 33 mm
The left end isn't at 0. Read where the right end is, then think what 1 cm is in millimetres.
The right end reads 43 mm; subtract the left end's 10 mm: 33 mm.
3. 156
1 cm = 10 mm. Change 15 cm to millimetres first, then add 6 mm.
15 × 10 + 6 = 156.
4. 15, 8
Every 10 mm is 1 cm. How many tens are there in 158?
Every 10 mm is 1 cm: 158 mm is 15 lots of 10 mm and 8 mm more.
5. 24 mm
The left end isn't at 0. Read where the right end is, then think what 2 cm is in millimetres.
The right end reads 44 mm; subtract the left end's 20 mm: 24 mm.
6. 196
1 cm = 10 mm. Change 19 cm to millimetres first, then add 6 mm.
19 × 10 + 6 = 196.
7. 46
Change 4 cm 2 mm into millimetres first, then add 4 mm.
4 cm 2 mm = 42 mm, and 4 + 42 = 46.
8. 54
Change 4 cm 7 mm into millimetres first, then add 7 mm.
4 cm 7 mm = 47 mm, and 7 + 47 = 54.

9. A. mm
A coin is very thin. Which unit is small enough for something that thin?
A coin is very thin, so use the smallest unit, millimetres: about 1 mm.
10. A. mm
A coin is very thin. Which unit is small enough for something that thin?
A coin is very thin, so use the smallest unit, millimetres: about 3 mm.
11. False
The units differ, so you can't compare yet. Change 9 cm 5 mm into millimetres first.
Same units first: 9 cm 5 mm = 95 mm, then compare with 104 mm.
12. True
The units differ, so you can't compare yet. Change 4 cm 9 mm into millimetres first.
Same units first: 4 cm 9 mm = 49 mm, then compare with 43 mm.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 155 mm
Change 17 cm 8 mm into millimetres first, then subtract the 23 mm.
17 cm 8 mm = 178 mm; 178 − 23 = 155.
14. 85 mm
The two ribbons use different units. Change the red one's 13 cm 6 mm into millimetres first.
The red one is 136 mm; the difference from 51 mm is 85 mm.
15. 90, 9
Work out how many millimetres 10 books make, then remember every 10 mm is 1 cm.
9 × 10 = 90 mm; every 10 mm is 1 cm: 9 cm.
16. 200, 20
Work out how many millimetres 25 books make, then remember every 10 mm is 1 cm.
8 × 25 = 200 mm; every 10 mm is 1 cm: 20 cm.
17. 108 mm
Change 11 cm 4 mm into millimetres first, then subtract the 6 mm.
11 cm 4 mm = 114 mm; 114 − 6 = 108.
18. 48 mm
The two ribbons use different units. Change the red one's 10 cm 2 mm into millimetres first.
The red one is 102 mm; the difference from 150 mm is 48 mm.

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