Keystones — Capstone
Five GCSE retrieval questions · 4 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: 2x² - 12x
Answer: 2(x - 3)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 27cm, angle = 67°. Give your answer to 2 decimal places
Answer: 173.98cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 45, 86, 74, 25, 75, 80. Give your answer to 2 decimal places
Answer: Mean = 64.43, Median = 74, Range = 61