Keystones — Capstone
Five GCSE retrieval questions · 9 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² - x - 7
Answer: (x - 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 72°. Give your answer to 2 decimal places
Answer: 153.6cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 37, 22, 50, 23, 44, 25, 25. Give your answer to 2 decimal places
Answer: Mean = 31.38, Median = 25, Range = 28