Keystones — Capstone
Five GCSE retrieval questions · 15 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 7
Answer: 5(x - 4)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 19cm, angle = 78°. Give your answer to 2 decimal places
Answer: 260.19cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 8:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 45, 91, 52, 49, 20, 71, 17, 74. Give your answer to 2 decimal places
Answer: Mean = 53.22, Median = 52, Range = 74