Keystones — Capstone
Five GCSE retrieval questions · 22 November 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 75°
Answer: 87.9cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 80, 80, 63, 72, 26, 60, 70
Answer: Mean = 59.4, Median = 70, Range = 56