Keystones — Capstone
Five GCSE retrieval questions · 26 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 9
Answer: 5(x - 6)² - 171 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 247.37cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 28:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 20, 16, 43, 19, 38, 51, 34. Give your answer to 2 decimal places
Answer: Mean = 38.38, Median = 36, Range = 70