Keystones — Capstone
Five GCSE retrieval questions · 17 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 7
Answer: 4(x - 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 75°. Give your answer to 2 decimal places
Answer: 286.88cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 22, 53, 24, 79, 40, 30, 13, 75. Give your answer to 2 decimal places
Answer: Mean = 41.56, Median = 38, Range = 66