Keystones — Capstone
Five GCSE retrieval questions · 26 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√75
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 4
Answer: 3(x - 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 63°. Give your answer to 2 decimal places
Answer: 387.59cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 26, 83, 65, 41, 20, 33, 93, 95. Give your answer to 2 decimal places
Answer: Mean = 53.56, Median = 41, Range = 75