Keystones — Capstone
Five GCSE retrieval questions · 20 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 5x - 12
Answer: (x - 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 66°. Give your answer to 2 decimal places
Answer: 171.29cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 80, 36, 41, 77, 65, 40. Give your answer to 2 decimal places
Answer: Mean = 55.71, Median = 51, Range = 44