Keystones — Capstone
Five GCSE retrieval questions · 2 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 9
Answer: 4(x - 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 59°. Give your answer to 2 decimal places
Answer: 150.86cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 99, 67, 56, 95, 52, 99, 77, 85. Give your answer to 2 decimal places
Answer: Mean = 79.22, Median = 83, Range = 47