Keystones — Capstone
Five GCSE retrieval questions · 28 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 50°. Give your answer to 2 decimal places
Answer: 116.44cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 95, 60, 24, 42, 40, 88. Give your answer to 2 decimal places
Answer: Mean = 63.71, Median = 60, Range = 73