Keystones — Capstone
Five GCSE retrieval questions · 30 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 4
Answer: (x - 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 71°. Give your answer to 2 decimal places
Answer: 112.52cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 18, 69, 53, 64, 35, 65. Give your answer to 2 decimal places
Answer: Mean = 52.29, Median = 62, Range = 51