Keystones — Capstone
Five GCSE retrieval questions · 13 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 12
Answer: 5(x - 6)² - 168 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 12cm, angle = 52°. Give your answer to 2 decimal places
Answer: 70.92cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 16, 51, 86, 37, 71, 20. Give your answer to 2 decimal places
Answer: Mean = 51.71, Median = 51, Range = 70