Keystones — Capstone
Five GCSE retrieval questions · 26 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 6
Answer: (x - 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 41°. Give your answer to 2 decimal places
Answer: 131.21cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 47, 48, 46, 75, 41, 37, 83
Answer: Mean = 58, Median = 47.5, Range = 50