Keystones — Capstone
Five GCSE retrieval questions · 12 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 12
Answer: 3(x + 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 59°. Give your answer to 2 decimal places
Answer: 87.43cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 62, 93, 100, 59, 65, 67, 83, 25. Give your answer to 2 decimal places
Answer: Mean = 72.44, Median = 67, Range = 75