Keystones — Capstone
Five GCSE retrieval questions · 8 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
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 = 29cm, b = 17cm, angle = 50°
Answer: 188.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 72, 52, 85, 11, 99, 24
Answer: Mean = 58.7, Median = 68, Range = 88