Keystones — Capstone
Five GCSE retrieval questions · 7 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 5x² - 40x
Answer: 5(x - 4)² - 80 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 64°. Give your answer to 2 decimal places
Answer: 168.52cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 76, 96, 94, 15, 10, 77, 36, 47. Give your answer to 2 decimal places
Answer: Mean = 58.22, Median = 73, Range = 86