Keystones — Capstone
Five GCSE retrieval questions · 30 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - 3x - 4
Answer: (x - 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 64°. Give your answer to 2 decimal places
Answer: 160.43cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 86, 64, 22, 68, 17, 22, 31, 25. Give your answer to 2 decimal places
Answer: Mean = 40.78, Median = 31, Range = 69