Keystones — Capstone
Five GCSE retrieval questions · 27 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 6
Answer: 3(x + 3)² - 21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 23cm, angle = 43°. Give your answer to 2 decimal places
Answer: 141.17cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 8:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 78, 64, 49, 11, 33, 43, 71, 55. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 55, Range = 67