Keystones — Capstone
Five GCSE retrieval questions · 17 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 59°
Answer: 138.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 28, 51, 30, 65, 41, 15
Answer: Mean = 41.4, Median = 41, Range = 50