Keystones — Capstone
Five GCSE retrieval questions · 13 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 6
Answer: 5(x + 3)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 46°. Give your answer to 2 decimal places
Answer: 110.06cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 58, 46, 73, 53, 54, 90, 85, 86. Give your answer to 2 decimal places
Answer: Mean = 64.33, Median = 58, Range = 56