Keystones — Capstone
Five GCSE retrieval questions · 12 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 14
Answer: 5(x - 1)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 80°. Give your answer to 2 decimal places
Answer: 295.44cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 22, 67, 18, 94, 12, 79, 16
Answer: Mean = 48, Median = 44.5, Range = 82