Keystones — Capstone
Five GCSE retrieval questions · 2 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 1
Answer: 2(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 67°. Give your answer to 2 decimal places
Answer: 303.77cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 41, 34, 65, 25, 67, 74, 49, 19. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 49, Range = 55