Keystones — Capstone
Five GCSE retrieval questions · 2 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 10
Answer: 3(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 203.29cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 21, 16, 98, 14, 25, 63, 11, 15. Give your answer to 2 decimal places
Answer: Mean = 33.78, Median = 21, Range = 87