Keystones — Capstone
Five GCSE retrieval questions · 29 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 1
Answer: 5(x - 6)² - 181 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 58°. Give your answer to 2 decimal places
Answer: 146.29cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 14:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 41, 72, 31, 89, 65, 43, 85
Answer: Mean = 64.5, Median = 68.5, Range = 59