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Millimetres and Centimetres Measurement

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Millimetres and Centimetres Measurement worksheet preview

Millimetres and Centimetres Measurement

Ruler showing millimetres and centimetres

📏 Part 1: Understanding mm and cm

1. How many millimetres make 1 centimetre?

5 millimetres

10 millimetres

100 millimetres

1000 millimetres

2. Which unit would be better for measuring the thickness of a coin?

Millimetres (mm)

Centimetres (cm)

3. Convert these measurements:

a) 3 cm = _______ mm

b) 50 mm = _______ cm

c) 7 cm = _______ mm

d) 20 mm = _______ cm

4. Circle the most sensible measurement for a pencil's length:

18 mm

18 cm

180 mm

📐 Part 2: Measuring Practice

5. Look at the ruler below and write the measurements:

(Imagine a ruler showing different objects at various positions)

Object A is _______ cm or _______ mm long

Object B is _______ cm or _______ mm long

6. Estimate first, then measure these classroom objects:

Paperclip:

My estimate: _______ mm Actual measurement: _______ mm

Eraser:

My estimate: _______ cm Actual measurement: _______ cm

7. Which measurements are the same? Draw lines to match:
40 mm
6 cm
15 mm
8 cm
1.5 cm
80 mm
4 cm
60 mm

🤔 Part 3: Thinking About Measurement

8. Explain why we sometimes use millimetres instead of centimetres for measuring:
9. Look around your classroom. Name two objects that would be best measured in:

Millimetres: _________________ and _________________

Centimetres: _________________ and _________________

10. Challenge: If a book is 2.3 cm thick, how many millimetres is that?

Show your working:

Answer: _______ mm

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