Keystones — Capstone
Five GCSE retrieval questions · 27 March 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 + 11x + 5
Answer: (x + 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 324.01cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 91, 87, 64, 79, 82, 58, 34
Answer: Mean = 70.5, Median = 74, Range = 57