Keystones — Capstone
Five GCSE retrieval questions · 15 April 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 - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 85.31cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 22, 75, 18, 48, 43, 38. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 43, Range = 69