Keystones — Capstone
Five GCSE retrieval questions · 7 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 10
Answer: 5(x + 6)² - 170 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 129.31cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 25, 73, 37, 19, 48, 11, 77. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 42.5, Range = 84