Keystones — Capstone
Five GCSE retrieval questions · 13 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 50°
Answer: 126.4cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 100, 95, 37, 86, 42, 66
Answer: Mean = 72.4, Median = 81, Range = 63