Keystones — Capstone
Five GCSE retrieval questions · 10 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 5
Answer: 3(x - 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 58°. Give your answer to 2 decimal places
Answer: 187.42cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 57, 24, 75, 73, 98, 78, 52, 65. Give your answer to 2 decimal places
Answer: Mean = 67.78, Median = 73, Range = 74