Keystones — Capstone
Five GCSE retrieval questions · 14 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 52°. Give your answer to 2 decimal places
Answer: 256.cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 42, 18, 44, 82, 94, 79, 72
Answer: Mean = 65.75, Median = 75.5, Range = 77