Keystones — Capstone
Five GCSE retrieval questions · 28 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 9
Answer: 2(x - 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 66°. Give your answer to 2 decimal places
Answer: 199.61cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 53, 94, 49, 48, 86, 17. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 53, Range = 77