Keystones — Capstone
Five GCSE retrieval questions · 20 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 3
Answer: 4(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 45°. Give your answer to 2 decimal places
Answer: 106.07cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 77, 71, 16, 25, 85, 92. Give your answer to 2 decimal places
Answer: Mean = 54.71, Median = 71, Range = 76