Question

You are repairing a fence and have 7.9 metres of wood. you need 10 metres

Answer 1

10 meters - 7.9 meters = 2.1 meters.
You need 2.1 more meters of wood.

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Answer 2

You need 2.10 meters of extra wood to get whole 10 meters.

Explanation:

You are repairing a fence and have 7.9 meters of wood.

You need 10 meters, this means you need some extra wood.

You need
`10-7.9=2.1` meters of extra wood

Therefore, you need 2.10 meters of extra wood to get whole 10 meters.