Keystones — Capstone
Five GCSE retrieval questions · 30 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - x - 7
Answer: (x - 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 30cm, angle = 59°. Give your answer to 2 decimal places
Answer: 167.15cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 14:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 47, 19, 83, 28, 47, 36, 14, 18. Give your answer to 2 decimal places
Answer: Mean = 34.67, Median = 28, Range = 69