Keystones — Capstone
Five GCSE retrieval questions · 17 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 60°. Give your answer to 2 decimal places
Answer: 149.39cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 24:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 14, 88, 62, 86, 62, 91, 77, 52. Give your answer to 2 decimal places
Answer: Mean = 63.11, Median = 62, Range = 77