Keystones — Capstone
Five GCSE retrieval questions · 29 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 41°. Give your answer to 2 decimal places
Answer: 142.69cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 86, 51, 54, 82, 31, 93, 72, 40. Give your answer to 2 decimal places
Answer: Mean = 61.89, Median = 54, Range = 62