Keystones — Capstone
Five GCSE retrieval questions · 30 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
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 = 15cm, b = 29cm, angle = 72°
Answer: 206.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 75, 59, 60, 48, 34, 10, 22, 90
Answer: Mean = 45.7, Median = 48, Range = 80