Keystones — Capstone
Five GCSE retrieval questions · 6 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 9
Answer: 2(x - 4)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 111.27cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 14:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 11, 31, 93, 23, 90, 89. Give your answer to 2 decimal places
Answer: Mean = 60.14, Median = 84, Range = 82