Keystones — Capstone
Five GCSE retrieval questions · 25 June 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 16cm, b = 23cm, angle = 41°
Answer: 120.7cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 12:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 86, 13, 75, 68, 57, 94, 35
Answer: Mean = 57.6, Median = 68, Range = 81