Keystones — Capstone
Five GCSE retrieval questions · 24 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 5x - 10
Answer: (x - 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 165.47cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 42, 100, 31, 84, 74, 42, 44
Answer: Mean = 58.5, Median = 47.5, Range = 69