Keystones — Capstone
Five GCSE retrieval questions · 28 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 5x - 1
Answer: (x - 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 179.24cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 55, 39, 67, 15, 29, 39, 32. Give your answer to 2 decimal places
Answer: Mean = 36.13, Median = 35.5, Range = 54