Keystones — Capstone
Five GCSE retrieval questions · 25 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: x² - x + 12
Answer: (x - 1⁄2)² + 47⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 66°. Give your answer to 2 decimal places
Answer: 194.13cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 94, 25, 90, 26, 34, 17. Give your answer to 2 decimal places
Answer: Mean = 50.14, Median = 34, Range = 77