Keystones — Capstone
Five GCSE retrieval questions · 5 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 4
Answer: 5(x + 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 20cm, angle = 72°. Give your answer to 2 decimal places
Answer: 161.68cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 89, 34, 59, 64, 83, 13, 39, 57. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 59, Range = 76