Keystones — Capstone
Five GCSE retrieval questions · 14 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
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 = 24cm, b = 23cm, angle = 65°
Answer: 250.cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 100, 28, 48, 43, 36, 38, 95, 34
Answer: Mean = 49.8, Median = 38, Range = 74