Keystones — Capstone
Five GCSE retrieval questions · 6 October 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 43°
Answer: 76.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 2:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 37, 66, 78, 54, 54, 48, 15, 12
Answer: Mean = 43.8, Median = 48, Range = 66