Keystones — Capstone
Five GCSE retrieval questions · 6 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 79°
Answer: 298.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:3. Find a:b:c.
Answer: 8:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 86, 29, 51, 57, 38, 62, 19
Answer: Mean = 47.8, Median = 51, Range = 67