Keystones — Capstone
Five GCSE retrieval questions · 9 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 13
Answer: 5(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 50°. Give your answer to 2 decimal places
Answer: 210.66cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 91, 57, 61, 96, 68, 63, 86. Give your answer to 2 decimal places
Answer: Mean = 76.38, Median = 77, Range = 39