Keystones — Capstone
Five GCSE retrieval questions · 12 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 1
Answer: (x - 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 76°. Give your answer to 2 decimal places
Answer: 139.72cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 13, 30, 73, 92, 72, 85. Give your answer to 2 decimal places
Answer: Mean = 66.14, Median = 73, Range = 85