Keystones — Capstone
Five GCSE retrieval questions · 4 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 15
Answer: 3(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 52°. Give your answer to 2 decimal places
Answer: 297.87cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 62, 19, 62, 57, 47, 78, 38, 56. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 57, Range = 59