Keystones — Capstone
Five GCSE retrieval questions · 29 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 12
Answer: 5(x - 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 22cm, angle = 70°. Give your answer to 2 decimal places
Answer: 279.09cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 30:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 34, 60, 49, 99, 71, 66, 98
Answer: Mean = 70.5, Median = 68.5, Range = 65