Keystones — Capstone
Five GCSE retrieval questions · 10 November 2018 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 52°
Answer: 113.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 4:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 15, 42, 43, 16, 18, 91, 25, 71
Answer: Mean = 37.3, Median = 25, Range = 76