Keystones — Capstone
Five GCSE retrieval questions · 28 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 9
Answer: 2(x + 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 44°. Give your answer to 2 decimal places
Answer: 138.58cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 54:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 40, 86, 71, 53, 76, 64, 25, 77. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 64, Range = 61