Keystones — Capstone
Five GCSE retrieval questions · 18 February 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
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 = 24cm, b = 14cm, angle = 61°
Answer: 146.9cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:5. Find a:b:c.
Answer: 3:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 58, 14, 30, 40, 100, 65, 98, 42
Answer: Mean = 51.7, Median = 42, Range = 86