Keystones — Capstone
Five GCSE retrieval questions · 16 November 2024 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 49°
Answer: 101.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 14, 38, 93, 25, 22, 28, 72
Answer: Mean = 45.9, Median = 38, Range = 79