Keystones — Capstone
Five GCSE retrieval questions · 26 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 5
Answer: 3(x - 6)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 44°. Give your answer to 2 decimal places
Answer: 112.88cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 88, 55, 51, 31, 76, 99. Give your answer to 2 decimal places
Answer: Mean = 62.86, Median = 55, Range = 68