Keystones — Capstone
Five GCSE retrieval questions · 18 July 2019 · 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 77°
Answer: 300.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 20, 49, 19, 37, 96, 23, 82, 43
Answer: Mean = 43.7, Median = 37, Range = 77