Keystones — Capstone
Five GCSE retrieval questions · 16 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 5
Answer: 5(x - 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 66°. Give your answer to 2 decimal places
Answer: 262.64cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 6:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 94, 15, 81, 90, 22, 83, 75. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 78, Range = 79