Keystones — Capstone
Five GCSE retrieval questions · 25 October 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 54°
Answer: 206.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 67, 50, 100, 17, 37, 20
Answer: Mean = 53.3, Median = 50, Range = 83