Keystones — Capstone
Five GCSE retrieval questions · 12 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 5x² - 20x
Answer: 5(x - 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 151.54cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 2:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 73, 62, 72, 46, 55, 40, 90, 75. Give your answer to 2 decimal places
Answer: Mean = 61.22, Median = 62, Range = 52