Keystones — Capstone
Five GCSE retrieval questions · 8 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² - 3x + 1
Answer: (x - 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 167.86cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 10:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 10, 99, 81, 50, 47, 10. Give your answer to 2 decimal places
Answer: Mean = 48.71, Median = 47, Range = 89