Keystones — Capstone
Five GCSE retrieval questions · 2 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² - 5x + 11
Answer: (x - 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 74°. Give your answer to 2 decimal places
Answer: 192.25cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 56:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 23, 43, 72, 97, 67, 65, 77
Answer: Mean = 66.5, Median = 69.5, Range = 74