Keystones — Capstone
Five GCSE retrieval questions · 18 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² - x - 5
Answer: (x - 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 22cm, angle = 43°. Give your answer to 2 decimal places
Answer: 105.03cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 33, 34, 21, 99, 64, 44. Give your answer to 2 decimal places
Answer: Mean = 46.43, Median = 34, Range = 78