Keystones — Capstone
Five GCSE retrieval questions · 31 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 6
Answer: 3(x - 4)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 74°. Give your answer to 2 decimal places
Answer: 346.05cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 85, 28, 48, 86, 85, 36, 20, 45. Give your answer to 2 decimal places
Answer: Mean = 50.22, Median = 45, Range = 67