Keystones — Capstone
Five GCSE retrieval questions · 17 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 12
Answer: 3(x + 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 51°. Give your answer to 2 decimal places
Answer: 232.37cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 4:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 47, 36, 65, 53, 67, 28. Give your answer to 2 decimal places
Answer: Mean = 46.86, Median = 47, Range = 39