Keystones — Capstone
Five GCSE retrieval questions · 17 January 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 71°
Answer: 260cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:4. Find a:b:c.
Answer: 6:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 61, 36, 99, 74, 80, 36, 22, 91
Answer: Mean = 64.9, Median = 74, Range = 77