Keystones — Capstone
Five GCSE retrieval questions · 27 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 3
Answer: (x + 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 66°. Give your answer to 2 decimal places
Answer: 147.54cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 48:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 51, 84, 72, 85, 30, 38, 34, 46
Answer: Mean = 59, Median = 51, Range = 61