Keystones — Capstone
Five GCSE retrieval questions · 30 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² + x - 11
Answer: (x + 1⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 65°. Give your answer to 2 decimal places
Answer: 342.58cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 3:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 49, 28, 51, 75, 47, 94
Answer: Mean = 54, Median = 49, Range = 66