Keystones — Capstone
Five GCSE retrieval questions · 7 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² + 7x - 9
Answer: (x + 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 85.cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 50, 40, 77, 88, 62, 33. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 50, Range = 56