Keystones — Capstone
Five GCSE retrieval questions · 4 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 12
Answer: 5(x - 6)² - 168 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 49°. Give your answer to 2 decimal places
Answer: 122.26cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 21:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 66, 54, 17, 35, 100, 55, 88, 59. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 55, Range = 83