Keystones — Capstone
Five GCSE retrieval questions · 26 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 3
Answer: 4(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 62°. Give your answer to 2 decimal places
Answer: 173.06cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 95, 91, 94, 81, 26, 77, 93, 12. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 81, Range = 83