Keystones — Capstone
Five GCSE retrieval questions · 28 October 2022 · 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 63°
Answer: 133.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 18, 30, 73, 67, 67, 90, 49
Answer: Mean = 61.4, Median = 67, Range = 79