Keystones — Capstone
Five GCSE retrieval questions · 29 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 73°. Give your answer to 2 decimal places
Answer: 221.86cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 19, 71, 59, 81, 61, 55, 21
Answer: Mean = 53.75, Median = 60, Range = 62