📏 Part 1: Reading Scales

1. Look at the ruler below. What is the length of the pencil in centimetres?

The pencil starts at 0 and ends between the 12cm and 13cm marks, closer to 12.5cm.

2. Circle the most appropriate unit for measuring each object:

Length of a classroom:

millimetres (mm)

centimetres (cm)

metres (m)

Thickness of a coin:

millimetres (mm)

centimetres (cm)

metres (m)

🔍 Part 2: Estimating Partial Units

3. When measuring with a ruler, some markings might be worn off or hard to see. If an object ends halfway between 8cm and 9cm, what would you estimate the length to be?

4. Fill in the blanks about measuring techniques:

When the end of an object falls between two marks on a ruler, I need to _____________ the measurement. The smallest unit I can measure accurately depends on the _____________ on my measuring tool.

5. Check all the good strategies for measuring accurately:

Start measuring from the 0 mark

Look at the ruler from directly above

Estimate when the measurement falls between marks

Always round up to the next whole number

Choose appropriate units for the object size

📐 Part 3: Practical Measurement

6. Measure three objects in your classroom and record your measurements:

Object 1: _________________ Length: _______ cm

Object 2: _________________ Length: _______ cm

Object 3: _________________ Length: _______ cm

7. Draw a line that is exactly 7.5 centimetres long in the box below:

8. Explain how you would measure the length of your desk if some of the centimetre marks on your ruler were missing:

🎯 Part 4: Problem Solving

9. Match each measurement tool with its best use:

1. 30cm ruler

2. Measuring tape

3. Metre stick

A. Measuring around curved objects

B. Measuring small objects like pencils

C. Measuring the height of a door

10. Sarah is measuring a book. The book starts at 0cm and ends just past the 15cm mark, but before the 16cm mark. She estimates it's about 15.3cm long. Do you think this is a reasonable estimate? Explain your thinking:

11. Convert these measurements:

25cm = _______ mm

1.5m = _______ cm

120mm = _______ cm