Keystones — Capstone
Five GCSE retrieval questions · 3 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 60°. Give your answer to 2 decimal places
Answer: 219.cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 67, 10, 42, 66, 24, 76, 47
Answer: Mean = 50, Median = 56.5, Range = 66