Keystones — Capstone
Five GCSE retrieval questions · 26 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 9
Answer: 2(x - 6)² - 63 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 51°. Give your answer to 2 decimal places
Answer: 232.37cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 69, 48, 34, 27, 42, 74. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 42, Range = 54