Accurate Length Measurement

Name:

Date:

📚 Part 1: Tool Choice & Quick Concepts

1. Which tool is best to measure the length of a wooden ruler to the nearest millimetre?

A flexible tape measure with mm markings

A metal or plastic ruler with mm divisions

A metre stick with only cm marks

An analogue kitchen scale

2. To measure the length of a classroom table accurately to the nearest mm, which is most appropriate?

Ruler (30 cm) only

Tape measure with mm markings

Eye estimate and recording in cm

A metre stick with no mm marks

3. True or false: Always place the zero mark at the start of the object (not at 1 cm) to avoid systematic error.

True

False

4. Check all actions that help reduce parallax and reading errors when using a ruler:

Keep your eye level with the measurement mark

Tilt the ruler and read from an angle

Ensure the ruler is flat against the object

Start reading from the 1 cm mark instead of zero

✏️ Part 2: Practical Measurement & Reasoning

5. Practical: Use a ruler with mm markings. Measure the length of a textbook (or similar object). Record your measurement to the nearest millimetre and include units.

6. A pair measured a box twice and got 23.2 cm and 23.4 cm. In one short sentence, explain whether these results show precision, accuracy, both, or neither. Justify your answer.

7. Convert and show working: 256 mm = ____ cm

8. Sketch and explain: On the space below, draw a small object and show where to place the zero of the ruler. Label one common mistake to avoid (use a short note).

9. Short reflection (one sentence): Name one simple strategy you would use to check the reasonableness of a measurement taken with a tape measure.