Keystones — Capstone
Five GCSE retrieval questions · 20 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 4
Answer: 5(x - 2)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 64°. Give your answer to 2 decimal places
Answer: 163.58cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 94, 94, 12, 75, 22, 49. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 49, Range = 82