Keystones — Capstone
Five GCSE retrieval questions · 16 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 11
Answer: 2(x - 5)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 80°. Give your answer to 2 decimal places
Answer: 344.68cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 43, 69, 60, 84, 13, 71, 20, 73. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 60, Range = 71