Keystones — Capstone
Five GCSE retrieval questions · 28 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√275
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 60°. Give your answer to 2 decimal places
Answer: 90.07cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 36:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 87, 72, 46, 47, 85, 64, 45. Give your answer to 2 decimal places
Answer: Mean = 64.88, Median = 68, Range = 42