Keystones — Capstone
Five GCSE retrieval questions · 15 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 2
Answer: 5(x + 6)² - 182 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 60°. Give your answer to 2 decimal places
Answer: 270.63cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 45:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 80, 77, 66, 13, 97, 64, 65. Give your answer to 2 decimal places
Answer: Mean = 64.63, Median = 65.5, Range = 84