Keystones — Capstone
Five GCSE retrieval questions · 7 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 14
Answer: 2(x - 4)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 169.81cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 27, 48, 95, 69, 51, 30. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 48, Range = 68