Keystones — Capstone
Five GCSE retrieval questions · 20 January 2018 · 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 - 3x - 7
Answer: (x - 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 73°. Give your answer to 2 decimal places
Answer: 120.49cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 18:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 22, 40, 40, 63, 32, 38, 49, 83. Give your answer to 2 decimal places
Answer: Mean = 45.11, Median = 40, Range = 61