Keystones — Capstone
Five GCSE retrieval questions · 30 June 2020 · 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 63°
Answer: 123cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 78, 57, 93, 83, 87, 85, 14, 40
Answer: Mean = 62.6, Median = 78, Range = 79