Keystones — Capstone
Five GCSE retrieval questions · 25 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - x + 2
Answer: (x - 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 77°. Give your answer to 2 decimal places
Answer: 235.31cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 27, 61, 48, 22, 63, 47
Answer: Mean = 45, Median = 47, Range = 41