Keystones — Capstone
Five GCSE retrieval questions · 22 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√125
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 2
Answer: 5(x - 4)² - 82 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 70°. Give your answer to 2 decimal places
Answer: 169.14cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 63, 85, 98, 27, 97, 43. Give your answer to 2 decimal places
Answer: Mean = 65.86, Median = 63, Range = 71