Keystones — Capstone
Five GCSE retrieval questions · 27 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 51°. Give your answer to 2 decimal places
Answer: 259.18cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 6:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 18, 21, 44, 83, 10, 54, 54, 75. Give your answer to 2 decimal places
Answer: Mean = 50.11, Median = 54, Range = 82