Keystones — Capstone
Five GCSE retrieval questions · 3 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 13
Answer: 3(x + 4)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 68°. Give your answer to 2 decimal places
Answer: 265.17cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 61, 36, 57, 50, 90, 42, 23. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 49, Range = 67