Keystones — Capstone
Five GCSE retrieval questions · 3 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 13
Answer: 5(x - 5)² - 112 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 70°. Give your answer to 2 decimal places
Answer: 258.89cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 15, 97, 88, 86, 62, 88, 88, 85. Give your answer to 2 decimal places
Answer: Mean = 69.78, Median = 86, Range = 82