Keystones — Capstone
Five GCSE retrieval questions · 21 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² + 9x + 5
Answer: (x + 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 52°. Give your answer to 2 decimal places
Answer: 189.12cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 66, 95, 43, 44, 48, 23, 13, 31
Answer: Mean = 43, Median = 43, Range = 82