Keystones — Capstone
Five GCSE retrieval questions · 19 April 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: 3x² + 24x - 1
Answer: 3(x + 4)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 28cm, angle = 48°. Give your answer to 2 decimal places
Answer: 301.72cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 9:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 41, 52, 18, 70, 57, 37. Give your answer to 2 decimal places
Answer: Mean = 41.57, Median = 41, Range = 54