Keystones — Capstone
Five GCSE retrieval questions · 24 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 3
Answer: (x + 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 65°. Give your answer to 2 decimal places
Answer: 228.39cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 17, 58, 74, 96, 64, 82, 33, 64. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 64, Range = 79