Keystones — Capstone
Five GCSE retrieval questions · 14 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 11x + 10
Answer: (x + 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 72°. Give your answer to 2 decimal places
Answer: 271.05cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 63, 59, 22, 27, 66, 82, 52, 47. Give your answer to 2 decimal places
Answer: Mean = 47.78, Median = 52, Range = 70