Keystones — Capstone
Five GCSE retrieval questions · 7 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 14
Answer: 3(x + 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 69°. Give your answer to 2 decimal places
Answer: 84.96cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 56, 12, 91, 25, 97, 55, 67, 31. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 56, Range = 88