Keystones — Capstone
Five GCSE retrieval questions · 11 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² - 5x + 3
Answer: (x - 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 44°. Give your answer to 2 decimal places
Answer: 117.4cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 34, 41, 25, 33, 71, 54, 76, 21
Answer: Mean = 41, Median = 34, Range = 62