Keystones — Capstone
Five GCSE retrieval questions · 23 June 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 26cm, angle = 64°
Answer: 140.2cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 31, 96, 59, 70, 42, 32
Answer: Mean = 49.7, Median = 42, Range = 78