Keystones — Capstone
Five GCSE retrieval questions · 2 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 13
Answer: 5(x - 6)² - 167 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 52°. Give your answer to 2 decimal places
Answer: 170.21cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 84, 71, 14, 67, 19, 62, 93, 49. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 62, Range = 82