Keystones — Capstone
Five GCSE retrieval questions · 22 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 75°. Give your answer to 2 decimal places
Answer: 246.31cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 28:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 38, 31, 75, 62, 67, 51, 77, 37. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 51, Range = 46