Keystones — Capstone
Five GCSE retrieval questions · 22 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 5x + 4
Answer: (x - 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 252.86cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 14, 61, 63, 97, 21, 84, 39, 57
Answer: Mean = 54, Median = 57, Range = 83