Keystones — Capstone
Five GCSE retrieval questions · 10 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 9x - 4
Answer: (x + 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 52°. Give your answer to 2 decimal places
Answer: 184.39cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 80, 88, 22, 22, 53, 19, 27. Give your answer to 2 decimal places
Answer: Mean = 48.38, Median = 40, Range = 69