Keystones — Capstone
Five GCSE retrieval questions · 20 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 5
Answer: 2(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 71°. Give your answer to 2 decimal places
Answer: 356.46cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 17, 39, 41, 62, 95, 33, 71, 84. Give your answer to 2 decimal places
Answer: Mean = 56.89, Median = 62, Range = 78