Keystones — Capstone
Five GCSE retrieval questions · 18 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² + 9x - 6
Answer: (x + 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 147.98cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 12, 81, 80, 54, 58, 32, 76, 59. Give your answer to 2 decimal places
Answer: Mean = 51.78, Median = 58, Range = 69