Keystones — Capstone
Five GCSE retrieval questions · 10 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 9x
Answer: (x - 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 60°. Give your answer to 2 decimal places
Answer: 254.61cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 56:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 69, 76, 95, 80, 85, 20, 54
Answer: Mean = 66.25, Median = 72.5, Range = 75