Keystones — Capstone
Five GCSE retrieval questions · 8 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 7
Answer: 5(x + 5)² - 118 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 64°. Give your answer to 2 decimal places
Answer: 155.04cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 12, 87, 75, 59, 55, 42, 85
Answer: Mean = 59.5, Median = 60, Range = 75