Keystones — Capstone
Five GCSE retrieval questions · 2 December 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 13cm, angle = 51°
Answer: 106.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 69, 62, 62, 80, 77, 28, 48, 20
Answer: Mean = 53.8, Median = 62, Range = 60