Keystones — Capstone
Five GCSE retrieval questions · 30 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 8
Answer: 5(x + 4)² - 88 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 53°. Give your answer to 2 decimal places
Answer: 140.16cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 18, 20, 40, 12, 26, 57, 20, 40. Give your answer to 2 decimal places
Answer: Mean = 30.44, Median = 26, Range = 45