Keystones — Capstone
Five GCSE retrieval questions · 27 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 7
Answer: 3(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 175.05cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 46, 50, 37, 53, 64, 59, 22, 18. Give your answer to 2 decimal places
Answer: Mean = 44.44, Median = 50, Range = 46