Keystones — Capstone
Five GCSE retrieval questions · 17 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 65°. Give your answer to 2 decimal places
Answer: 125.07cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 72, 43, 83, 69, 68, 36, 48, 23. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 48, Range = 60