128 Is What Percent Of 640? Show Work

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Anonymous answered
128/640 is 0.2 so 128/640 is 20%.
You can cross multiply to find the answer like so:

128/640 = x/100  

100*128/640= x

12800/640=x

20=x

Or you could divide 640 by 6.4 because you know that it will give you 100 and then divide 128 by 6.4 also which would give you 20.

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