Keystones — Capstone
Five GCSE retrieval questions · 14 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 12
Answer: 2(x - 4)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 79°. Give your answer to 2 decimal places
Answer: 206.14cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 15:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 17, 80, 54, 43, 51, 64, 24, 29. Give your answer to 2 decimal places
Answer: Mean = 43.22, Median = 43, Range = 63