Keystones — Capstone
Five GCSE retrieval questions · 28 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² - 3x - 11
Answer: (x - 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 76°. Give your answer to 2 decimal places
Answer: 212.01cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 14, 92, 16, 49, 40, 60. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 40, Range = 78