Keystones — Capstone
Five GCSE retrieval questions · 27 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√40
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 5
Answer: (x - 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 239.33cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 37, 62, 51, 29, 63, 47, 98
Answer: Mean = 50.75, Median = 49, Range = 79