Keystones — Capstone
Five GCSE retrieval questions · 24 September 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 45°
Answer: 200.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 4:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 34, 19, 38, 82, 44, 60, 63
Answer: Mean = 52.1, Median = 60, Range = 63