Keystones — Capstone
Five GCSE retrieval questions · 6 March 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: 2x² - 8x + 7
Answer: 2(x - 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 68°. Give your answer to 2 decimal places
Answer: 194.71cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 48:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 72, 64, 18, 89, 79, 67
Answer: Mean = 67, Median = 72, Range = 71