Keystones — Capstone
Five GCSE retrieval questions · 4 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: 3x² + 18x
Answer: 3(x + 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 73°. Give your answer to 2 decimal places
Answer: 87.02cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 66, 63, 45, 30, 39, 98, 28, 37. Give your answer to 2 decimal places
Answer: Mean = 47.56, Median = 39, Range = 76