Keystones — Capstone
Five GCSE retrieval questions · 22 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 65°. Give your answer to 2 decimal places
Answer: 119.63cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 76, 18, 60, 24, 82, 63. Give your answer to 2 decimal places
Answer: Mean = 47.86, Median = 60, Range = 70