Keystones — Capstone
Five GCSE retrieval questions · 15 October 2020 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 63°
Answer: 254.8cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:5. Find a:b:c.
Answer: 8:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 61, 92, 58, 25, 66, 84, 47, 46
Answer: Mean = 58.1, Median = 58, Range = 67