Keystones — Capstone
Five GCSE retrieval questions · 11 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 144.71cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 31, 67, 87, 63, 19, 55, 72, 47. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 55, Range = 68