Keystones — Capstone
Five GCSE retrieval questions · 18 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 2
Answer: 2(x - 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 69°. Give your answer to 2 decimal places
Answer: 308.08cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 24:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 74, 56, 97, 82, 89, 79, 63, 87. Give your answer to 2 decimal places
Answer: Mean = 80.22, Median = 82, Range = 41