Keystones — Capstone
Five GCSE retrieval questions · 16 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 7
Answer: 5(x - 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 79°. Give your answer to 2 decimal places
Answer: 255.22cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 68, 10, 35, 31, 91, 65
Answer: Mean = 48, Median = 36, Range = 81