Keystones — Capstone
Five GCSE retrieval questions · 22 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² + 7x + 5
Answer: (x + 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 55°. Give your answer to 2 decimal places
Answer: 172.02cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 45:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 25, 93, 76, 77, 84, 14
Answer: Mean = 61, Median = 76, Range = 79