Keystones — Capstone
Five GCSE retrieval questions · 10 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 13
Answer: 3(x - 4)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 46°. Give your answer to 2 decimal places
Answer: 129.48cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 36:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 71, 60, 57, 39, 17, 82, 15, 62. Give your answer to 2 decimal places
Answer: Mean = 47.67, Median = 57, Range = 67