Keystones — Capstone
Five GCSE retrieval questions · 6 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² - 3x + 7
Answer: (x - 3⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 43°. Give your answer to 2 decimal places
Answer: 106.39cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 84, 95, 56, 100, 53, 85, 61. Give your answer to 2 decimal places
Answer: Mean = 77.38, Median = 84.5, Range = 47