Keystones — Capstone
Five GCSE retrieval questions · 23 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² + 5x - 7
Answer: (x + 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 50°. Give your answer to 2 decimal places
Answer: 235.94cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 14:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 70, 59, 46, 21, 78, 26. Give your answer to 2 decimal places
Answer: Mean = 51.29, Median = 59, Range = 57