Keystones — Capstone
Five GCSE retrieval questions · 30 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² + 7x - 3
Answer: (x + 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 53°. Give your answer to 2 decimal places
Answer: 183.69cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 10:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 66, 38, 77, 26, 95, 54, 76, 66. Give your answer to 2 decimal places
Answer: Mean = 57.11, Median = 66, Range = 79