Keystones — Capstone
Five GCSE retrieval questions · 30 March 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: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 61°. Give your answer to 2 decimal places
Answer: 79.59cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 30, 94, 23, 60, 23, 31, 59, 78. Give your answer to 2 decimal places
Answer: Mean = 46.11, Median = 31, Range = 77