Keystones — Capstone
Five GCSE retrieval questions · 12 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 12
Answer: 3(x + 5)² - 87 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 62°. Give your answer to 2 decimal places
Answer: 159.37cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 56:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 58, 39, 33, 70, 44, 55, 60, 52. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 55, Range = 40