Keystones — Capstone
Five GCSE retrieval questions · 7 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 11
Answer: 4(x - 5)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 99.72cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 84, 81, 79, 64, 24, 43. Give your answer to 2 decimal places
Answer: Mean = 60.86, Median = 64, Range = 60