Keystones — Capstone
Five GCSE retrieval questions · 29 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 13
Answer: 2(x - 5)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 78°. Give your answer to 2 decimal places
Answer: 224.97cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 63, 45, 67, 25, 60, 51, 70. Give your answer to 2 decimal places
Answer: Mean = 55.88, Median = 61.5, Range = 45