Keystones — Capstone
Five GCSE retrieval questions · 1 October 2012 · 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: 5x² + 60x + 4
Answer: 5(x + 6)² - 176 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 52°. Give your answer to 2 decimal places
Answer: 138.3cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 20, 50, 86, 35, 59, 97. Give your answer to 2 decimal places
Answer: Mean = 53.57, Median = 50, Range = 77