Keystones — Capstone
Five GCSE retrieval questions · 6 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² + 3x - 5
Answer: (x + 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 270.63cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 83, 92, 44, 61, 48, 83, 63, 67
Answer: Mean = 64, Median = 63, Range = 57