Keystones — Capstone
Five GCSE retrieval questions · 1 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 13
Answer: 3(x + 6)² - 121 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 147.55cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 35, 69, 98, 44, 71, 48, 36, 97. Give your answer to 2 decimal places
Answer: Mean = 65.89, Median = 69, Range = 63