Keystones — Capstone
Five GCSE retrieval questions · 23 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 3
Answer: 5(x + 6)² - 177 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 49°. Give your answer to 2 decimal places
Answer: 103.02cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 44, 87, 17, 44, 75, 69. Give your answer to 2 decimal places
Answer: Mean = 49.43, Median = 44, Range = 77