Keystones — Capstone
Five GCSE retrieval questions · 7 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 54°. Give your answer to 2 decimal places
Answer: 73.62cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 93, 42, 82, 13, 52, 10, 90. Give your answer to 2 decimal places
Answer: Mean = 59.63, Median = 67, Range = 85