Keystones — Capstone
Five GCSE retrieval questions · 8 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 40°
Answer: 46.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 39, 31, 75, 25, 78, 58, 41, 68
Answer: Mean = 56.2, Median = 58, Range = 66