Keystones — Capstone
Five GCSE retrieval questions · 1 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 2
Answer: (x - 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 72°. Give your answer to 2 decimal places
Answer: 126.49cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 47, 66, 25, 37, 71, 52, 89, 36
Answer: Mean = 51, Median = 47, Range = 64