Keystones — Capstone
Five GCSE retrieval questions · 4 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 12
Answer: 5(x - 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 41°. Give your answer to 2 decimal places
Answer: 165.33cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 67, 42, 64, 10, 41, 46, 93, 65. Give your answer to 2 decimal places
Answer: Mean = 58.56, Median = 64, Range = 89