Keystones — Capstone
Five GCSE retrieval questions · 24 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 4
Answer: (x - 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 104.18cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 16:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 54, 94, 10, 12, 41, 82, 62
Answer: Mean = 49.25, Median = 47.5, Range = 84