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Measuring Length with Rulers
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Measuring Length with Rulers
Help plan a small exhibition display. Use mm and cm carefully, show your working, and include units in every answer.
Ruler skills and units
A metric ruler is marked in mm and cm. There are 10 mm in 1 cm. If an object does not begin at zero, subtract its start reading from its end reading.
1.A label begins at the 0 mm mark and ends at 68 mm. What is its length in centimetres?
2.A strip starts at the 14 mm mark and ends at the 93 mm mark on a ruler. Calculate its length. Explain why you subtract rather than use 93 mm as the answer.
3.Choose the most suitable unit for measuring the thickness of a cardboard display card: metres, centimetres or millimetres.
- metres
- centimetres
- millimetres
4.Convert 4.7 cm into mm.
5.Convert 126 mm into centimetres. Give your answer to one decimal place.
6.A measured ribbon is 8.4 cm long. Which measurement is equivalent?
- 0.84 mm
- 8.4 mm
- 84 mm
- 840 mm
7.Three students measure the same card. Maia records 12.3 cm, 12.4 cm and 12.3 cm. The card's accepted length is 12.4 cm. Are Maia's measurements precise, accurate, both or neither? Explain using the readings.
8.A student measures a 10 cm line but holds their eye well to the side of the ruler while reading the endpoint. What measurement error could this cause, and what should the student do?
9.A display needs three equal-width panels, each 7.6 cm wide. What is the total width in centimetres and mm?
10.A student measures a small component as 35 mm, then writes 3.5 cm in the plan. Is the conversion correct? State the equivalent length and explain.
11.The marked points on this ruler are 2.0 cm, 2.5 cm, 3.0 cm, 3.5 cm and 4.0 cm. A pin starts at 2.0 cm and ends at 4.0 cm. Find its length in mm.
12.A student needs to cut a strip to 9.2 cm. Give two practical ruler-reading habits that would help make the cut length accurate.
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