Keystones — Capstone
Five GCSE retrieval questions · 19 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 14
Answer: 3(x - 2)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 60°. Give your answer to 2 decimal places
Answer: 117.78cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 28:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 98, 85, 67, 32, 21, 16, 36. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 51.5, Range = 82