Keystones — Capstone
Five GCSE retrieval questions · 8 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 76°. Give your answer to 2 decimal places
Answer: 234.33cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 63, 46, 89, 20, 54, 31. Give your answer to 2 decimal places
Answer: Mean = 45.71, Median = 46, Range = 72