Keystones — Capstone
Five GCSE retrieval questions · 23 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 3
Answer: 2(x + 5)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 246.47cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 42:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 52, 62, 41, 83, 12, 57, 69, 91. Give your answer to 2 decimal places
Answer: Mean = 58.67, Median = 61, Range = 79