Keystones — Capstone
Five GCSE retrieval questions · 25 March 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 64°
Answer: 251.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 57, 14, 76, 34, 40, 83, 100
Answer: Mean = 51.8, Median = 57, Range = 90