Keystones — Capstone
Five GCSE retrieval questions · 15 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 8
Answer: 3(x - 3)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 78°. Give your answer to 2 decimal places
Answer: 198.56cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 25, 26, 32, 48, 15, 65, 81, 45. Give your answer to 2 decimal places
Answer: Mean = 39.33, Median = 32, Range = 66