Keystones — Capstone
Five GCSE retrieval questions · 18 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 12
Answer: 2(x - 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 62°. Give your answer to 2 decimal places
Answer: 264.88cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 13, 95, 88, 90, 36, 99, 77, 31. Give your answer to 2 decimal places
Answer: Mean = 60.22, Median = 77, Range = 86