Keystones — Capstone
Five GCSE retrieval questions · 25 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - 5x - 10
Answer: (x - 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 88.3cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 30, 42, 75, 92, 84, 33, 25, 69. Give your answer to 2 decimal places
Answer: Mean = 58.89, Median = 69, Range = 67