Keystones — Capstone
Five GCSE retrieval questions · 9 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 65°. Give your answer to 2 decimal places
Answer: 195.76cm² -
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: 25, 95, 36, 29, 82, 36, 75
Answer: Mean = 54, Median = 36, Range = 70