Keystones — Capstone
Five GCSE retrieval questions · 17 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - x - 9
Answer: (x - 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 54°. Give your answer to 2 decimal places
Answer: 110.43cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 6:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 25, 36, 27, 60, 79, 82. Give your answer to 2 decimal places
Answer: Mean = 47.14, Median = 36, Range = 61