Keystones — Capstone
Five GCSE retrieval questions · 31 July 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 53°
Answer: 156.5cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 35, 31, 34, 40, 48, 64
Answer: Mean = 46.7, Median = 40, Range = 44