Keystones — Capstone
Five GCSE retrieval questions · 17 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 9
Answer: 4(x - 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 69°. Give your answer to 2 decimal places
Answer: 256.73cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 25, 10, 89, 27, 95, 13, 61, 20. Give your answer to 2 decimal places
Answer: Mean = 42.89, Median = 27, Range = 85