Keystones — Capstone
Five GCSE retrieval questions · 6 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 1
Answer: 5(x - 3)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 45°. Give your answer to 2 decimal places
Answer: 141.07cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 25, 32, 24, 76, 33, 36, 90, 13. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 33, Range = 80