Keystones — Capstone
Five GCSE retrieval questions · 26 January 2023 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√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 = 29cm, b = 21cm, angle = 43°
Answer: 207.7cm² -
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: 70, 57, 36, 74, 26, 30, 17, 51
Answer: Mean = 45.1, Median = 51, Range = 57