Keystones — Capstone
Five GCSE retrieval questions · 3 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 14
Answer: 5(x + 5)² - 139 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 136.98cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 50, 26, 95, 96, 29, 56, 28, 21. Give your answer to 2 decimal places
Answer: Mean = 50.22, Median = 50, Range = 75