Keystones — Capstone
Five GCSE retrieval questions · 12 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√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 = 12cm, b = 23cm, angle = 76°. Give your answer to 2 decimal places
Answer: 133.9cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 71, 71, 64, 56, 77, 80
Answer: Mean = 68, Median = 71, Range = 24