Keystones — Capstone
Five GCSE retrieval questions · 20 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 3
Answer: 3(x + 5)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 66°. Give your answer to 2 decimal places
Answer: 139.77cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 28:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 65, 100, 68, 85, 66, 100, 53. Give your answer to 2 decimal places
Answer: Mean = 77.38, Median = 75, Range = 47