Keystones — Capstone
Five GCSE retrieval questions · 18 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 6
Answer: 3(x + 5)² - 81 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 61°. Give your answer to 2 decimal places
Answer: 141.69cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 53, 89, 56, 10, 44, 43
Answer: Mean = 54, Median = 53, Range = 79