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When a person combines milk of one percentage with milk of another in order to create milk with a lower fat content.
"Dude, I hate the way 1% milk tastes but I'm watching my weight. So I did some milk math and mixed 1% and 2% to get 1 1/2%. It's not as good as 2% milk, but it's better than 1%."
by Friendofthemilkmathmaster January 02, 2011