📏 Key Facts to Remember

10 mm = 1 cm | 100 cm = 1 m | 1000 mm = 1 m

To convert mm → cm: divide by 10 | To convert cm → m: divide by 100

To convert cm → mm: multiply by 10 | To convert m → cm: multiply by 100

🔢 Part 1: Conversion Practice

Complete the conversions below. Show your working in the box provided.

1. A pencil is 145 mm long. Convert this to centimetres.

Answer: _________ cm

2. A classroom door is 2 m tall. Convert this to centimetres.

Answer: _________ cm

3. A piece of ribbon is 85 cm long. Convert this to metres.

Answer: _________ m

4. A beetle is 23 mm long. Convert this to centimetres.

Answer: _________ cm

5. A swimming pool is 1.5 m deep. How many centimetres is that?

Answer: _________ cm

6. Fill in the missing values in the table:

Millimetres      Centimetres      Metres

50 mm            _________ cm          _________ m

_________ mm    30 cm              _________ m

_________ mm    _________ cm          2 m

🌏 Part 2: Real-Life Problems & Estimation

7. Which unit (mm, cm, or m) would you use to measure each of the following? Circle your answer.

a) The length of a football field: mm cm m

b) The thickness of a coin: mm cm m

c) The height of a desk: mm cm m

8. Tama is measuring his bedroom. One wall is 350 cm long and another is 280 cm long. What is the total length of both walls? Give your answer in metres.

Answer: _________ m

9. Aroha has a piece of wood that is 1.2 m long. She cuts off a piece that is 45 cm. How many centimetres of wood does she have left?

Answer: _________ cm

10. Estimate the length of your desk in centimetres, then measure it. How close was your estimate?

My estimate: _________ cm Actual measurement: _________ cm Difference: _________ cm