Keystones — Capstone
Five GCSE retrieval questions · 10 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√24
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 71°. Give your answer to 2 decimal places
Answer: 204.23cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:40:32 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 92, 63, 92, 55, 59, 77. Give your answer to 2 decimal places
Answer: Mean = 66.14, Median = 63, Range = 67