Keystones — Capstone
Five GCSE retrieval questions · 13 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 10
Answer: (x + 3⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 27cm, angle = 61°. Give your answer to 2 decimal places
Answer: 236.15cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 55, 76, 67, 91, 40, 87, 40
Answer: Mean = 68.75, Median = 71.5, Range = 54