Keystones — Capstone
Five GCSE retrieval questions · 28 November 2021 · 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 + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 49°
Answer: 156.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:5. Find a:b:c.
Answer: 2:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 94, 20, 77, 75, 61, 98
Answer: Mean = 64, Median = 75, Range = 78