Keystones — Capstone
Five GCSE retrieval questions · 11 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 1
Answer: 2(x - 4)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 48°. Give your answer to 2 decimal places
Answer: 133.77cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 6:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 87, 48, 77, 40, 95, 78, 26, 71. Give your answer to 2 decimal places
Answer: Mean = 68.22, Median = 77, Range = 69