Keystones — Capstone
Five GCSE retrieval questions · 9 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 40°
Answer: 173.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 6:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 38, 14, 62, 20, 45, 19
Answer: Mean = 30.3, Median = 20, Range = 48