Keystones — Capstone
Five GCSE retrieval questions · 20 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 8
Answer: 2(x + 3)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 60°. Give your answer to 2 decimal places
Answer: 84.87cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 2:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 12, 74, 52, 19, 45, 77, 85
Answer: Mean = 57.25, Median = 63, Range = 82