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Millimetres and Centimetres Measurement

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Millimetres and Centimetres Measurement

Aotearoa’s Miniature Makers are preparing tiny models for a display. Help them measure and compare lengths in millimetres (mm) and centimetres (cm). Use the relationship between centimetres and millimetres. Show your working where needed.

Calibrate your measuring tools

Use the number line to picture how millimetres and centimetres relate.

1.The first tick on a centimetre ruler is 1 cm. How many millimetres is that?

1 mm
10 mm
100 mm
1,000 mm

2.A model door is 4 cm wide. Convert its width to millimetres.

3.A tiny wheel is 35 mm across. How many centimetres and millimetres is this?

Measure the model parts

Study the scale below. Each small interval represents 5 mm. The objects start at 0 mm; read where each object ends.

4.On the scale, the first marked endpoint is the length of a model flag. Write its length in millimetres and centimetres.

5.The second marked endpoint shows a model bridge’s length. Write it in centimetres and millimetres.

6.Which is longer: the 45 mm bridge or a 4 cm model path? How much longer is it?

Plan and solve

The team is packing miniature parts and checking that each measurement makes sense.

7.Match each measurement with an equal length.

6 cm
2.5 cm
90 mm
4 cm 3 mm

43 mm
60 mm
25 mm
9 cm

8.A miniature bench is 7 cm long. Choose the equivalent measurement.

7 mm
70 mm
700 mm
0.7 mm

9.A model sign is 2.6 cm tall. Convert its height to millimetres.

10.Which unit is more useful for recording the thickness of a thin cardboard sheet: mm or cm? Explain why.

11.A maker cuts a strip 8 cm long, then trims off 17 mm. How long is the strip now? Give your answer in millimetres and in centimetres plus millimetres.

12.A model tower is recorded as 5 cm 8 mm tall. Another maker writes 58 mm. Are the measurements equal? Show how you know.