Keystones — Capstone
Five GCSE retrieval questions · 4 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 78°. Give your answer to 2 decimal places
Answer: 258.23cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 2:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 90, 32, 89, 48, 74, 65
Answer: Mean = 61, Median = 65, Range = 61