## Exam-Style Question on Error Bounds## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 448. This question is similar to one that appeared on a GCSE Higher paper in 2017. The use of a calculator is allowed.

The height of a tree is 9 metres to the nearest metre.

(a) Complete the error interval for the height of the tree.

$$ ........ m \le height \lt ........ m $$The height of a different tree is 7 metres to the nearest metre.

Mr Schneebly says "The sum of the heights of the two trees is 17 metres to the nearest metre."

(b) Give an example to show that he could be correct.

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If you need more practice try the self-checking interactive exercises called Upper and Lower Bounds.

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