Keystones — Capstone
Five GCSE retrieval questions · 10 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 5x
Answer: (x - 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 14cm, angle = 75°. Give your answer to 2 decimal places
Answer: 155.51cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 36:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 41, 92, 68, 25, 86, 16, 51, 25. Give your answer to 2 decimal places
Answer: Mean = 48.33, Median = 41, Range = 76