Keystones — Capstone
Five GCSE retrieval questions · 5 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 4
Answer: 3(x - 5)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 40°. Give your answer to 2 decimal places
Answer: 92.56cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 79, 86, 91, 76, 68, 62. Give your answer to 2 decimal places
Answer: Mean = 79.14, Median = 79, Range = 30