Keystones — Capstone
Five GCSE retrieval questions · 23 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√12
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 56°. Give your answer to 2 decimal places
Answer: 144.25cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 35, 39, 49, 54, 77, 50. Give your answer to 2 decimal places
Answer: Mean = 51.14, Median = 50, Range = 42