Keystones — Capstone
Five GCSE retrieval questions · 14 September 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: 5x² + 60x + 13
Answer: 5(x + 6)² - 167 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 345.67cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 32:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 49, 100, 41, 53, 47, 100, 29
Answer: Mean = 61, Median = 51, Range = 71