Keystones — Capstone
Five GCSE retrieval questions · 4 August 2020 · 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 = 20cm, b = 27cm, angle = 46°
Answer: 194.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 91, 59, 73, 84, 50, 23, 86, 87
Answer: Mean = 65.3, Median = 73, Range = 68