Keystones — Capstone
Five GCSE retrieval questions · 10 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 243.95cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 20, 51, 46, 46, 69, 32, 69, 11. Give your answer to 2 decimal places
Answer: Mean = 46.22, Median = 46, Range = 61