Keystones — Capstone
Five GCSE retrieval questions · 8 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 3
Answer: (x + 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 53°. Give your answer to 2 decimal places
Answer: 95.04cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 45, 49, 43, 30, 51, 31, 80, 45
Answer: Mean = 44, Median = 45, Range = 58