Keystones — Capstone
Five GCSE retrieval questions · 22 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 4
Answer: (x + 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 74°. Give your answer to 2 decimal places
Answer: 276.84cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 21, 74, 88, 75, 55, 31. Give your answer to 2 decimal places
Answer: Mean = 61.14, Median = 74, Range = 67