Keystones — Capstone
Five GCSE retrieval questions · 12 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² - x - 11
Answer: (x - 1⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 45°. Give your answer to 2 decimal places
Answer: 105.71cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 12:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 73, 43, 24, 22, 95, 35, 41, 46. Give your answer to 2 decimal places
Answer: Mean = 52.78, Median = 43, Range = 74