Keystones — Capstone
Five GCSE retrieval questions · 17 January 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 - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 56°. Give your answer to 2 decimal places
Answer: 290.16cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 44, 54, 82, 52, 57, 48, 55, 79. Give your answer to 2 decimal places
Answer: Mean = 53.67, Median = 54, Range = 70