Keystones — Capstone
Five GCSE retrieval questions · 22 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + 3x - 8
Answer: (x + 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 52°. Give your answer to 2 decimal places
Answer: 141.84cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 12:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 72, 39, 48, 39, 100, 11, 74. Give your answer to 2 decimal places
Answer: Mean = 52.63, Median = 43.5, Range = 89