Keystones — Capstone
Five GCSE retrieval questions · 14 September 2016 · 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: 2x² - 16x - 10
Answer: 2(x - 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 71°. Give your answer to 2 decimal places
Answer: 172.08cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 20, 88, 36, 88, 64, 81, 17, 19. Give your answer to 2 decimal places
Answer: Mean = 47.67, Median = 36, Range = 72