Keystones — Capstone
Five GCSE retrieval questions · 3 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 52°
Answer: 170.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:3. Find a:b:c.
Answer: 8:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 36, 41, 35, 25, 70, 83, 32
Answer: Mean = 51.8, Median = 41, Range = 67