Keystones — Capstone
Five GCSE retrieval questions · 11 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 13
Answer: 2(x - 2)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 14cm, angle = 76°. Give your answer to 2 decimal places
Answer: 142.63cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 4:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 70, 50, 51, 20, 55, 66, 65
Answer: Mean = 58, Median = 60, Range = 67