Keystones — Capstone
Five GCSE retrieval questions · 23 April 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√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 = 27cm, b = 26cm, angle = 59°
Answer: 300.9cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 94, 62, 78, 48, 18, 78, 35
Answer: Mean = 54.5, Median = 62, Range = 76