Keystones — Capstone
Five GCSE retrieval questions · 2 October 2018 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 40°
Answer: 130.5cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 75, 19, 39, 64, 21, 44, 46, 29
Answer: Mean = 44, Median = 44, Range = 56