Keystones — Capstone
Five GCSE retrieval questions · 12 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 53°
Answer: 140.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 82, 60, 100, 25, 31, 60, 99, 54
Answer: Mean = 61.7, Median = 60, Range = 75