Keystones — Capstone
Five GCSE retrieval questions · 2 June 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 72°
Answer: 97cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 80, 77, 59, 44, 76, 63, 63, 28
Answer: Mean = 57, Median = 63, Range = 57