Keystones — Capstone
Five GCSE retrieval questions · 26 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√75
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 6
Answer: 5(x + 3)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 47°. Give your answer to 2 decimal places
Answer: 130.55cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 47, 56, 32, 27, 57, 48, 14, 56. Give your answer to 2 decimal places
Answer: Mean = 44.11, Median = 48, Range = 46