Keystones — Capstone
Five GCSE retrieval questions · 30 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 4
Answer: 2(x + 3)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 114.9cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 18:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 53, 15, 19, 74, 91, 73, 54, 96. Give your answer to 2 decimal places
Answer: Mean = 62.33, Median = 73, Range = 81