Keystones — Capstone
Five GCSE retrieval questions · 12 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 8
Answer: 2(x + 6)² - 80 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 45°. Give your answer to 2 decimal places
Answer: 286.38cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 55, 73, 46, 37, 45, 32
Answer: Mean = 54, Median = 46, Range = 58