Keystones — Capstone
Five GCSE retrieval questions · 6 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 9
Answer: 3(x + 4)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 54°. Give your answer to 2 decimal places
Answer: 89.4cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 56:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 42, 64, 37, 63, 85, 38, 42. Give your answer to 2 decimal places
Answer: Mean = 53.88, Median = 51, Range = 48