Keystones — Capstone
Five GCSE retrieval questions · 30 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 3
Answer: 2(x + 4)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 60°. Give your answer to 2 decimal places
Answer: 199.19cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 59, 23, 78, 41, 22, 50, 69, 40. Give your answer to 2 decimal places
Answer: Mean = 48.22, Median = 50, Range = 56