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Explain how to estimate the length of an object

Step-by-step explanation:

for short lengths try your hand span.

for something a bit longer try using the length of your feet.

for something even longer try using your arm span or steps.

Step-by-step explanation:

To measure something accurately you should use standard units

You should use different units for different lengths:

millimetres (mm) are good for very small lengths - like the width of a pencil or your finger

centimetres (cm) are good for something a bit longer - like the length of a pencil or a book

metres (m) are good for something even longer - like the width of a room or the length of building

kilometres (km) are good for longer distances - like the distance between home and school, or between different towns

You should use proper instruments to measure accurately, like a ruler, tape measure, metre stick or trundle wheel.

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