Keystones — Capstone
Five GCSE retrieval questions · 17 October 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
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 = 28cm, b = 25cm, angle = 76°
Answer: 339.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 15, 59, 96, 73, 34, 85, 10, 27
Answer: Mean = 48.9, Median = 41, Range = 86