Keystones — Capstone
Five GCSE retrieval questions · 4 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√50
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 8
Answer: 5(x + 6)² - 172 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 136.57cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 24, 32, 65, 68, 19, 24, 66
Answer: Mean = 39.5, Median = 28, Range = 50