Keystones — Capstone
Five GCSE retrieval questions · 11 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² + 9x - 1
Answer: (x + 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 45°. Give your answer to 2 decimal places
Answer: 110.31cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 24, 53, 97, 96, 25, 61, 92
Answer: Mean = 59, Median = 57, Range = 73