Keystones — Capstone
Five GCSE retrieval questions · 13 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 54°. Give your answer to 2 decimal places
Answer: 160.19cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 43, 41, 59, 75, 68, 79, 21, 85. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 59, Range = 72