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Estimating Length, Mass, Capacity

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Estimating Length, Mass, Capacity

At the fishing harbour, Nikau, Talia and Losa are getting ready for a busy day. Use the clues and pictures to estimate and compare. For length, think in centimetres; for mass, think in grams or kilograms; for capacity, think in millilitres or litres.

Estimate and compare

Choose the most sensible estimate for each harbour object.

1.A small fish is about how long?

20 centimetres
20 metres
20 kilometres

2.A coil of rope is about how heavy?

2 grams
2 kilograms
2 tonnes

3.A small drink bottle holds about how much?

500 millilitres
500 litres
500 kilolitres

4.Talia thinks a harbour rope is 3 centimetres long. Is that a sensible estimate? Write a better unit and explain briefly.

Order and reason

Use what you know about everyday sizes and amounts.

5.Put these lengths in order from shortest to longest: a 15 cm fish, a 1 m oar, a 5 m rope.

6.Which is heavier: a 1 kg bag of bait or a 500 g bag of bait? How do you know?

7.Nikau pours 1 litre of water into a jug. How many 500 mL bottles can he fill?

8.True or false? A 2 litre bucket can hold more water than a 1 litre jug.

TrueFalse

9.The harbour crew needs to estimate the length of a bench. Which tool would give a useful measurement: a ruler marked in centimetres, a kitchen scale, or a measuring jug? Explain your choice.

10.Choose an object you can see nearby. Write an estimate of its length and name a suitable unit. Then say how you could check your estimate with a measuring tool.