Exam-Style Question on Standard Form
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 658. This question is similar to one that appeared on a GCSE Higher paper in 2020. The use of a calculator is allowed.
A hippopotamus' heart beats approximately \(5.04 \times 10^4\) times in a day when resting.
The average lifespan of a hippopotamus is \(61\) years.
(a) Work out an estimate for the number of times a hippopotamus’ heart beats in their lifetime. Give your answer in standard form correct to 3 significant figures.
(b) A hippopotamus would eat approximately \(10^6\) kg of grass in its lifetime. Use this figure to calculate an estimate of how many kilograms of grass a hippopotamus eats each day. Give your answer correct to the nearest kilogram.
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