Keystones — Capstone
Five GCSE retrieval questions · 22 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 3x - 4
Answer: (x + 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 15cm, angle = 56°. Give your answer to 2 decimal places
Answer: 174.cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 25, 62, 42, 19, 82, 58, 34, 46. Give your answer to 2 decimal places
Answer: Mean = 42.78, Median = 42, Range = 65