Keystones — Capstone
Five GCSE retrieval questions · 9 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 6
Answer: (x + 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 80°. Give your answer to 2 decimal places
Answer: 172.83cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 26, 24, 73, 77, 33, 99, 31, 61. Give your answer to 2 decimal places
Answer: Mean = 52.78, Median = 51, Range = 75