Keystones — Capstone
Five GCSE retrieval questions · 13 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 143.72cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 20, 12, 98, 91, 63, 18. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 63, Range = 86