Keystones — Capstone
Five GCSE retrieval questions · 23 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 16cm, angle = 77°. Give your answer to 2 decimal places
Answer: 132.51cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 10:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 67, 15, 92, 29, 27, 36, 67, 41
Answer: Mean = 51, Median = 41, Range = 77