Keystones — Capstone
Five GCSE retrieval questions · 30 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√150
Answer: 25√6 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 67°. Give your answer to 2 decimal places
Answer: 157.41cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 15, 75, 44, 36, 91, 64. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 44, Range = 76