Valuable percentages

Weekly Problem 23 - 2010
These numbers have been written as percentages. Can you work out which has the greatest value?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
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Problem



Which of the following has the greatest value?

A) 50% of 10

B) 40% of 20

C) 30% of 30

D) 20% of 40

E) 10% of 50

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.