Keystones — Capstone
Five GCSE retrieval questions · 5 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 42°. Give your answer to 2 decimal places
Answer: 176.99cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 10:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 73, 96, 63, 63, 73, 83, 23
Answer: Mean = 60.5, Median = 68, Range = 86