Keystones — Capstone
Five GCSE retrieval questions · 3 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 3
Answer: 3(x - 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 60°. Give your answer to 2 decimal places
Answer: 168.87cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 2:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 99, 63, 59, 48, 38, 41. Give your answer to 2 decimal places
Answer: Mean = 54.71, Median = 48, Range = 64