Keystones — Capstone
Five GCSE retrieval questions · 12 February 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 52°
Answer: 190.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 15, 35, 47, 71, 87, 38
Answer: Mean = 44.3, Median = 38, Range = 72