Keystones — Capstone
Five GCSE retrieval questions · 16 April 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 71°
Answer: 119.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:5. Find a:b:c.
Answer: 3:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 50, 72, 20, 92, 29, 58
Answer: Mean = 47.3, Median = 50, Range = 82