Keystones — Capstone
Five GCSE retrieval questions · 16 May 2012 · 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 + 7x + 9
Answer: (x + 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 40°. Give your answer to 2 decimal places
Answer: 221.76cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 19, 95, 35, 94, 32, 23, 24, 57. Give your answer to 2 decimal places
Answer: Mean = 44.33, Median = 32, Range = 76