Keystones — Capstone
Five GCSE retrieval questions · 22 October 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 53°
Answer: 110.2cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:5. Find a:b:c.
Answer: 9:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 43, 91, 15, 19, 11, 43
Answer: Mean = 38.1, Median = 43, Range = 80