Keystones — Capstone
Five GCSE retrieval questions · 13 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² + 7x + 5
Answer: (x + 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 73°. Give your answer to 2 decimal places
Answer: 415.99cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 71, 49, 99, 67, 10, 43, 76, 46. Give your answer to 2 decimal places
Answer: Mean = 56.89, Median = 51, Range = 89