Keystones — Capstone
Five GCSE retrieval questions · 26 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 52°. Give your answer to 2 decimal places
Answer: 82.74cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 48:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 94, 33, 10, 34, 20, 75, 32, 15. Give your answer to 2 decimal places
Answer: Mean = 40.44, Median = 33, Range = 84