Keystones — Capstone
Five GCSE retrieval questions · 5 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 14
Answer: 4(x - 3)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 41°. Give your answer to 2 decimal places
Answer: 187.63cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 20:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 51, 78, 84, 65, 49, 13. Give your answer to 2 decimal places
Answer: Mean = 59.43, Median = 65, Range = 71