Keystones — Capstone
Five GCSE retrieval questions · 23 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 58°. Give your answer to 2 decimal places
Answer: 86.5cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 30:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 33, 34, 46, 84, 68, 58, 96, 15. Give your answer to 2 decimal places
Answer: Mean = 50.44, Median = 46, Range = 81