Keystones — Capstone
Five GCSE retrieval questions · 21 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 12
Answer: (x + 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 40°. Give your answer to 2 decimal places
Answer: 150.41cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 12, 58, 85, 71, 13, 70, 44. Give your answer to 2 decimal places
Answer: Mean = 55.38, Median = 64, Range = 78