Keystones — Capstone
Five GCSE retrieval questions · 9 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 68°. Give your answer to 2 decimal places
Answer: 111.26cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 44, 23, 23, 46, 94, 59, 99
Answer: Mean = 52.25, Median = 45, Range = 76