Keystones — Capstone
Five GCSE retrieval questions · 21 August 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 + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 68°
Answer: 211.4cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:5. Find a:b:c.
Answer: 3:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 68, 68, 70, 58, 42, 11, 100
Answer: Mean = 62.6, Median = 68, Range = 89