Keystones — Capstone
Five GCSE retrieval questions · 7 December 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 47°
Answer: 105.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 60, 99, 60, 14, 23, 96, 80, 62
Answer: Mean = 56.1, Median = 60, Range = 88