Keystones — Capstone
Five GCSE retrieval questions · 28 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 5x - 4
Answer: (x - 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 232.65cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 2:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 99, 50, 14, 41, 24, 45. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 41, Range = 85