Keystones — Capstone
Five GCSE retrieval questions · 17 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 9
Answer: 3(x + 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 48°. Give your answer to 2 decimal places
Answer: 323.27cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 82, 35, 98, 67, 42, 58. Give your answer to 2 decimal places
Answer: Mean = 64.29, Median = 67, Range = 63