Keystones — Capstone
Five GCSE retrieval questions · 10 January 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 75°
Answer: 201.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 93, 18, 61, 69, 83, 75, 83
Answer: Mean = 67.6, Median = 75, Range = 75