Keystones — Capstone
Five GCSE retrieval questions · 20 December 2022 · 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 42°
Answer: 91.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 50, 32, 58, 22, 75, 23, 23, 13
Answer: Mean = 34.3, Median = 23, Range = 62