Keystones — Capstone
Five GCSE retrieval questions · 27 July 2012 · 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: 3x² - 30x - 6
Answer: 3(x - 5)² - 81 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 67°. Give your answer to 2 decimal places
Answer: 298.24cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 22, 46, 29, 83, 77, 93
Answer: Mean = 57, Median = 49, Range = 71