Keystones — Capstone
Five GCSE retrieval questions · 22 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 129.59cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 31, 94, 88, 28, 84, 82, 78, 48
Answer: Mean = 67, Median = 78, Range = 66