Keystones — Capstone
Five GCSE retrieval questions · 1 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 4
Answer: 2(x + 6)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 50°. Give your answer to 2 decimal places
Answer: 140.95cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:42:12 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 15, 25, 88, 84, 61, 31, 86, 55. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 55, Range = 73