Keystones — Capstone
Five GCSE retrieval questions · 27 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√24
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 11
Answer: (x - 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 177.28cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 2:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 34, 61, 61, 30, 47, 100, 55, 27. Give your answer to 2 decimal places
Answer: Mean = 48.44, Median = 47, Range = 79