Keystones — Capstone
Five GCSE retrieval questions · 7 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 10
Answer: (x - 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 76°. Give your answer to 2 decimal places
Answer: 221.23cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 20, 93, 11, 86, 17, 58, 49. Give your answer to 2 decimal places
Answer: Mean = 43.13, Median = 34.5, Range = 82