Keystones — Capstone
Five GCSE retrieval questions · 20 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² + 11x + 10
Answer: (x + 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 60°. Give your answer to 2 decimal places
Answer: 140.73cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 28:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 45, 84, 73, 47, 28, 31. Give your answer to 2 decimal places
Answer: Mean = 53.71, Median = 47, Range = 56