Keystones — Capstone
Five GCSE retrieval questions · 23 December 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: 2x² - 4x - 6
Answer: 2(x - 1)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 303.09cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 47, 58, 32, 85, 36, 57, 14. Give your answer to 2 decimal places
Answer: Mean = 45.88, Median = 42.5, Range = 71