Keystones — Capstone
Five GCSE retrieval questions · 7 February 2015 · 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 - 20x - 7
Answer: 5(x - 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 54°. Give your answer to 2 decimal places
Answer: 204.68cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 11, 71, 90, 91, 82, 51, 96, 34. Give your answer to 2 decimal places
Answer: Mean = 62.22, Median = 71, Range = 85