Keystones — Capstone
Five GCSE retrieval questions · 10 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 7
Answer: 4(x + 4)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 48°. Give your answer to 2 decimal places
Answer: 166.46cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 63:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 25, 66, 52, 25, 13, 95. Give your answer to 2 decimal places
Answer: Mean = 50.86, Median = 52, Range = 82