Keystones — Capstone
Five GCSE retrieval questions · 3 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 52°
Answer: 151.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 9:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 20, 22, 93, 55, 57, 12, 19
Answer: Mean = 39.1, Median = 35, Range = 81