Keystones — Capstone
Five GCSE retrieval questions · 17 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 8
Answer: 4(x - 3)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 68°. Give your answer to 2 decimal places
Answer: 236.43cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 72:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 32, 62, 23, 54, 84, 89. Give your answer to 2 decimal places
Answer: Mean = 52.14, Median = 54, Range = 68