Number, Ratio & Estimation

Topic overview

Numerical values, units, bounds, proportion and growth/decay

Key concepts

Limits of rational powers in calculus and sums and differences after simplification; differentiation of exponential/trigonometric functions, variance, distributions of random variables, or mathematical induction are not required. Basic expected frequencies remain within the syllabus.

Key points

◆Follow the prerequisite knowledge requirements given by the examination body; new concepts may only be used when the question provides sufficient guidance.
◆The examples on this site are training with a limited scope and do not represent full syllabus coverage or official difficulty.

Worked examples

Try each example yourself before checking the explanation.

1Basic examples within scope

A rectangle has length $8.4$ cm and width $3.2$ cm, each correct to the nearest $0.1$ cm. Which is the upper bound for its area?

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