Keystones — Capstone
Five GCSE retrieval questions · 17 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² + 9x - 1
Answer: (x + 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 69°. Give your answer to 2 decimal places
Answer: 277.27cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 76, 51, 19, 40, 30, 79, 43
Answer: Mean = 45.5, Median = 41.5, Range = 60