Keystones — Capstone
Five GCSE retrieval questions · 7 July 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 62°
Answer: 143.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 2:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 52, 16, 76, 82, 29, 11, 47
Answer: Mean = 50.1, Median = 52, Range = 77