Keystones — Capstone
Five GCSE retrieval questions · 25 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 8
Answer: 5(x - 2)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 57°. Give your answer to 2 decimal places
Answer: 147.61cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 61, 73, 87, 40, 86, 77
Answer: Mean = 67, Median = 73, Range = 47