Keystones — Capstone
Five GCSE retrieval questions · 26 January 2022 · 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 + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 75°
Answer: 104.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:4. Find a:b:c.
Answer: 12:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 85, 30, 28, 75, 40, 73, 93
Answer: Mean = 64.9, Median = 75, Range = 67