Keystones — Capstone
Five GCSE retrieval questions · 22 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 3x - 11
Answer: (x - 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 52°. Give your answer to 2 decimal places
Answer: 204.88cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 82, 16, 30, 15, 47, 62, 58, 92
Answer: Mean = 46, Median = 47, Range = 80