Keystones — Capstone
Five GCSE retrieval questions · 24 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 186.52cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 13, 18, 61, 68, 40, 43. Give your answer to 2 decimal places
Answer: Mean = 45.14, Median = 43, Range = 60