Keystones — Capstone
Five GCSE retrieval questions · 27 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 5
Answer: 4(x - 4)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 62°. Give your answer to 2 decimal places
Answer: 143.04cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 63:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 18, 38, 88, 26, 72, 13, 52, 12. Give your answer to 2 decimal places
Answer: Mean = 45.44, Median = 38, Range = 78