Keystones — Capstone
Five GCSE retrieval questions · 30 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 7
Answer: 2(x - 3)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 63°. Give your answer to 2 decimal places
Answer: 139cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 12:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 18, 39, 93, 31, 44, 48, 19. Give your answer to 2 decimal places
Answer: Mean = 45.13, Median = 41.5, Range = 75