Keystones — Capstone
Five GCSE retrieval questions · 8 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 12
Answer: (x + 11⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 29cm, angle = 68°. Give your answer to 2 decimal places
Answer: 295.77cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 87, 88, 37, 36, 64, 17, 37. Give your answer to 2 decimal places
Answer: Mean = 52.63, Median = 46, Range = 71