Keystones — Capstone
Five GCSE retrieval questions · 23 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 10
Answer: 3(x + 4)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 48°. Give your answer to 2 decimal places
Answer: 126.33cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 2:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 20, 80, 81, 61, 10, 87
Answer: Mean = 52, Median = 61, Range = 77