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Measuring Length with Units

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Measuring Length with Units

Aotearoa’s walking club is planning a route and packing gear. Use metric units throughout. Show working where needed. For estimate-and-measure tasks, answers will depend on your own measurements.

Choose and convert units

Use mm, cm, m or km as appropriate. Remember: 10 mm = 1 cm, 100 cm = 1 m, and 1,000 m = 1 km.

1.The group packs a map that is 24 units long, walks a track that is 3 units long, and checks a token that is 6 units thick. Choose the most suitable unit (mm, cm, m or km) for each measurement.

2.Convert 4.6 m into centimetres.

3.A tent peg is 185 mm long. Write this length in centimetres and millimetres.

4.The marked number line shows distances in metres. Which marked distance is greatest, and by how many metres is it greater than the smallest?

Measure, compare and reason

A route planner records supplies and distances for the walk.

Item

Recorded length

Water hose

2.35 m

Walking track

3.8 km

Flagging ribbon

875 mm

5.How many centimetres long is the water hose?

6.Express the walking track length in metres.

7.Which is longer: the hose or the ribbon? By how many centimetres?

8.A route has two sections: 1.25 km and 860 m. What is the total distance in metres?

9.Two walkers measured the same picnic table using hand spans. Maia counted 7 spans and Wiremu counted 8. Give a likely reason their counts differ, and explain why a tape measure gives a more reliable length.

10.Estimate the length of one object nearby, then measure it with a ruler or tape measure. Record the object, estimate and actual length in centimetres, then calculate how far your estimate was from the actual length.

11.Draw a straight line exactly 8 cm long. Label its length and name the tool you would use to check it.