Keystones — Capstone
Five GCSE retrieval questions · 4 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 64°. Give your answer to 2 decimal places
Answer: 124.03cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 45, 41, 64, 99, 46, 13, 67, 65. Give your answer to 2 decimal places
Answer: Mean = 57.11, Median = 64, Range = 86