Keystones — Capstone
Five GCSE retrieval questions · 9 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 6
Answer: 4(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 70°. Give your answer to 2 decimal places
Answer: 109.94cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 52, 78, 56, 47, 50, 28. Give your answer to 2 decimal places
Answer: Mean = 51.71, Median = 51, Range = 50