Keystones — Capstone
Five GCSE retrieval questions · 1 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 4
Answer: 3(x + 2)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 51°. Give your answer to 2 decimal places
Answer: 114.24cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 39, 72, 94, 61, 41, 62. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 61, Range = 82