Keystones — Capstone
Five GCSE retrieval questions · 17 September 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: 3x² - 18x + 9
Answer: 3(x - 3)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 71°. Give your answer to 2 decimal places
Answer: 271.84cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 77, 35, 19, 69, 99, 27, 43, 57. Give your answer to 2 decimal places
Answer: Mean = 49.22, Median = 43, Range = 82