Keystones — Capstone
Five GCSE retrieval questions · 15 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 2
Answer: 2(x - 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 44°. Give your answer to 2 decimal places
Answer: 126.43cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:20:32 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 60, 30, 83, 55, 76, 31, 58, 62. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 58, Range = 53