Keystones — Capstone
Five GCSE retrieval questions · 11 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 14
Answer: 2(x - 1)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 108.19cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 17, 82, 23, 65, 24, 82. Give your answer to 2 decimal places
Answer: Mean = 49.86, Median = 56, Range = 65