Keystones — Capstone
Five GCSE retrieval questions · 24 April 2015 · 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 - x - 1
Answer: (x - 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 51°. Give your answer to 2 decimal places
Answer: 163.2cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 92, 20, 75, 23, 67, 63
Answer: Mean = 51, Median = 63, Range = 75