Keystones — Capstone
Five GCSE retrieval questions · 20 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√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 = 22cm, b = 28cm, angle = 70°
Answer: 289.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 34, 16, 52, 80, 42, 13, 25
Answer: Mean = 37.4, Median = 37, Range = 67