Keystones — Capstone
Five GCSE retrieval questions · 30 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 3
Answer: 3(x + 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 71°. Give your answer to 2 decimal places
Answer: 248.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 32, 71, 26, 35, 53, 82. Give your answer to 2 decimal places
Answer: Mean = 45.29, Median = 35, Range = 64