Keystones — Capstone
Five GCSE retrieval questions · 24 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² - 3x - 6
Answer: (x - 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 233.46cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 16:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 86, 51, 39, 99, 30, 16, 59
Answer: Mean = 58.25, Median = 55, Range = 83