Keystones — Capstone
Five GCSE retrieval questions · 8 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√176
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 14
Answer: 2(x + 3)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 75°. Give your answer to 2 decimal places
Answer: 173.87cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 98, 65, 64, 86, 63, 47. Give your answer to 2 decimal places
Answer: Mean = 69.14, Median = 64, Range = 51