Keystones — Capstone
Five GCSE retrieval questions · 29 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 1
Answer: (x + 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 52°. Give your answer to 2 decimal places
Answer: 205.67cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:40:32 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 75, 28, 91, 55, 35, 25, 25, 11. Give your answer to 2 decimal places
Answer: Mean = 46.11, Median = 35, Range = 80