Keystones — Capstone
Five GCSE retrieval questions · 25 November 2015 · 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: x² + 7x + 11
Answer: (x + 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 71°. Give your answer to 2 decimal places
Answer: 177.28cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 8:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 56, 88, 86, 97, 32, 16, 49. Give your answer to 2 decimal places
Answer: Mean = 62.88, Median = 67.5, Range = 81