Keystones — Capstone
Five GCSE retrieval questions · 18 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 53°. Give your answer to 2 decimal places
Answer: 83.06cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 10, 43, 57, 15, 54, 79, 30, 60. Give your answer to 2 decimal places
Answer: Mean = 40.56, Median = 43, Range = 69