Keystones — Capstone
Five GCSE retrieval questions · 7 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 169.29cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 84, 29, 85, 63, 49, 85, 85
Answer: Mean = 62.25, Median = 73.5, Range = 67