Keystones — Capstone
Five GCSE retrieval questions · 9 January 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 42°
Answer: 128.5cm² -
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: 31, 34, 55, 15, 91, 85, 45
Answer: Mean = 50.9, Median = 45, Range = 76