Keystones — Capstone
Five GCSE retrieval questions · 28 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 3
Answer: 3(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 63°. Give your answer to 2 decimal places
Answer: 374.22cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 39, 20, 70, 43, 62, 37
Answer: Mean = 42, Median = 39, Range = 50