Keystones — Capstone
Five GCSE retrieval questions · 30 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 13
Answer: 3(x + 5)² - 88 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 54°. Give your answer to 2 decimal places
Answer: 252.41cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 35, 11, 90, 51, 97, 72, 12. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 43, Range = 86