Keystones — Capstone
Five GCSE retrieval questions · 8 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 12
Answer: (x + 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 56°. Give your answer to 2 decimal places
Answer: 91.61cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 19, 18, 24, 10, 54, 28, 18. Give your answer to 2 decimal places
Answer: Mean = 28.88, Median = 21.5, Range = 50