Keystones — Capstone
Five GCSE retrieval questions · 7 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 10
Answer: 5(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 19cm, angle = 45°. Give your answer to 2 decimal places
Answer: 167.94cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 20, 30, 77, 20, 15, 30. Give your answer to 2 decimal places
Answer: Mean = 39.57, Median = 30, Range = 70