Keystones — Capstone
Five GCSE retrieval questions · 21 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + x - 4
Answer: (x + 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 303.97cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 28, 20, 19, 90, 10, 21, 11, 22. Give your answer to 2 decimal places
Answer: Mean = 25.67, Median = 20, Range = 80