Keystones — Capstone
Five GCSE retrieval questions · 19 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + 11x + 9
Answer: (x + 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 64°. Give your answer to 2 decimal places
Answer: 128.08cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 99, 82, 87, 52, 62, 40, 54, 14
Answer: Mean = 57, Median = 54, Range = 85