Keystones — Capstone
Five GCSE retrieval questions · 11 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + x - 8
Answer: (x + 1⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 49°. Give your answer to 2 decimal places
Answer: 112.83cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 78, 10, 61, 26, 69, 51, 36
Answer: Mean = 47, Median = 48, Range = 68