Keystones — Capstone
Five GCSE retrieval questions · 30 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 1
Answer: 5(x + 2)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 75°. Give your answer to 2 decimal places
Answer: 156.48cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 71, 84, 86, 37, 92, 86. Give your answer to 2 decimal places
Answer: Mean = 71.71, Median = 84, Range = 55