Keystones — Capstone
Five GCSE retrieval questions · 1 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 4
Answer: 2(x + 5)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 65°. Give your answer to 2 decimal places
Answer: 289.11cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 27:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 48, 56, 49, 34, 70, 51, 38, 22
Answer: Mean = 51, Median = 49, Range = 69