Keystones — Capstone
Five GCSE retrieval questions · 15 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 5
Answer: 3(x - 5)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 62°. Give your answer to 2 decimal places
Answer: 169.53cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 89, 61, 31, 97, 77, 42. Give your answer to 2 decimal places
Answer: Mean = 66.86, Median = 71, Range = 66