Keystones — Capstone
Five GCSE retrieval questions · 13 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 75°. Give your answer to 2 decimal places
Answer: 163.24cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 36, 87, 83, 80, 71, 52, 21, 43. Give your answer to 2 decimal places
Answer: Mean = 60.22, Median = 69, Range = 66