Keystones — Capstone
Five GCSE retrieval questions · 25 July 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 64°
Answer: 289.4cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 75, 45, 60, 94, 23, 83, 65
Answer: Mean = 59.1, Median = 65, Range = 71