Keystones — Capstone
Five GCSE retrieval questions · 28 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
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 = 23cm, angle = 63°. Give your answer to 2 decimal places
Answer: 174.19cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 52, 87, 99, 95, 40, 86, 28, 68
Answer: Mean = 67, Median = 68, Range = 71