Keystones — Capstone
Five GCSE retrieval questions · 17 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 70°
Answer: 160.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 41, 92, 81, 84, 56, 42, 15, 52
Answer: Mean = 55.2, Median = 52, Range = 77