Keystones — Capstone
Five GCSE retrieval questions · 9 November 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 52°
Answer: 104cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 80, 50, 99, 21, 32, 25, 31
Answer: Mean = 50.6, Median = 50, Range = 78