Keystones — Capstone
Five GCSE retrieval questions · 11 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 9x + 6
Answer: (x - 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 251.79cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 24, 90, 20, 35, 85, 14, 55
Answer: Mean = 43.5, Median = 30, Range = 76