Keystones — Capstone
Five GCSE retrieval questions · 16 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 7
Answer: 2(x + 4)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 54°. Give your answer to 2 decimal places
Answer: 121.35cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:14:10 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 36, 39, 84, 13, 80, 50. Give your answer to 2 decimal places
Answer: Mean = 56.86, Median = 50, Range = 83