Keystones — Capstone
Five GCSE retrieval questions · 3 October 2021 · 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 = 27cm, b = 28cm, angle = 69°
Answer: 352.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 96, 85, 69, 79, 56, 66, 26, 31
Answer: Mean = 59.7, Median = 66, Range = 70