Keystones — Capstone
Five GCSE retrieval questions · 23 March 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 62°
Answer: 173.cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 65, 22, 82, 84, 63, 90
Answer: Mean = 61.6, Median = 65, Range = 68