Keystones — Capstone
Five GCSE retrieval questions · 14 May 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
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 = 22cm, b = 30cm, angle = 64°
Answer: 296.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 4:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 39, 46, 72, 20, 65, 26, 73
Answer: Mean = 46.3, Median = 46, Range = 53