Keystones — Capstone
Five GCSE retrieval questions · 8 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 14
Answer: 2(x - 3)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 77°. Give your answer to 2 decimal places
Answer: 266cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 56, 75, 30, 87, 66, 64, 19, 27. Give your answer to 2 decimal places
Answer: Mean = 56.44, Median = 64, Range = 68