Keystones — Capstone
Five GCSE retrieval questions · 17 October 2019 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 65°
Answer: 229.3cm² -
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: 20, 23, 87, 55, 51, 86, 31, 83, 24
Answer: Mean = 51.1, Median = 51, Range = 67