Keystones — Capstone
Five GCSE retrieval questions · 20 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: x² + 3x + 2
Answer: (x + 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 52°. Give your answer to 2 decimal places
Answer: 133.17cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 50, 75, 70, 32, 79, 78. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 70, Range = 47