Keystones — Capstone
Five GCSE retrieval questions · 20 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 12
Answer: 5(x - 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 80°. Give your answer to 2 decimal places
Answer: 280.67cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 40:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 18, 41, 51, 67, 74, 32, 22, 47. Give your answer to 2 decimal places
Answer: Mean = 46.22, Median = 47, Range = 56