Keystones — Capstone
Five GCSE retrieval questions · 10 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 6
Answer: 3(x + 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 42°. Give your answer to 2 decimal places
Answer: 190.7cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 60, 95, 80, 62, 40, 17. Give your answer to 2 decimal places
Answer: Mean = 57.71, Median = 60, Range = 78