Keystones — Capstone
Five GCSE retrieval questions · 26 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 7
Answer: 5(x + 6)² - 187 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 141.83cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 16:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 66, 68, 57, 34, 26, 82, 71. Give your answer to 2 decimal places
Answer: Mean = 59.63, Median = 67, Range = 56