Exam-Style Question on Standard Form

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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 hippopotamusâ€™ 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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