Keystones — Capstone
Five GCSE retrieval questions · 1 September 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 60°
Answer: 72.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 80, 61, 69, 52, 90, 24, 37
Answer: Mean = 56, Median = 61, Range = 66