Keystones — Capstone
Five GCSE retrieval questions · 19 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 15
Answer: 4(x - 6)² - 159 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 394.67cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 53, 54, 26, 40, 67, 40
Answer: Mean = 53, Median = 53, Range = 65