Keystones — Capstone
Five GCSE retrieval questions · 11 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 10
Answer: 3(x - 5)² - 65 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 45°. Give your answer to 2 decimal places
Answer: 190.92cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 54:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 47, 77, 25, 24, 16, 47, 33
Answer: Mean = 40.75, Median = 40, Range = 61