Keystones — Capstone
Five GCSE retrieval questions · 18 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 176.12cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 71, 58, 44, 10, 69, 21, 66
Answer: Mean = 48.75, Median = 54.5, Range = 61