Keystones — Capstone
Five GCSE retrieval questions · 14 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² - 36x + 2
Answer: 3(x - 6)² - 106 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 66°. Give your answer to 2 decimal places
Answer: 320.65cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 21:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 84, 64, 13, 87, 33, 100, 40, 80. Give your answer to 2 decimal places
Answer: Mean = 66.56, Median = 80, Range = 87