Keystones — Capstone
Five GCSE retrieval questions · 21 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√96
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 43°. Give your answer to 2 decimal places
Answer: 181.41cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 10, 77, 76, 59, 25, 95. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 59, Range = 85