Keystones — Capstone
Five GCSE retrieval questions · 15 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 16cm, angle = 52°
Answer: 82cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 4:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 81, 25, 87, 97, 20, 51, 59
Answer: Mean = 61.1, Median = 69, Range = 77