Keystones — Capstone
Five GCSE retrieval questions · 19 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√40
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 53°. Give your answer to 2 decimal places
Answer: 335.43cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 16:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 25, 31, 56, 18, 20, 40, 81. Give your answer to 2 decimal places
Answer: Mean = 43.88, Median = 35.5, Range = 63