Keystones — Capstone
Five GCSE retrieval questions · 22 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 2
Answer: (x + 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 44°. Give your answer to 2 decimal places
Answer: 145.88cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 71, 86, 67, 42, 74, 11
Answer: Mean = 54, Median = 67, Range = 75