CROSS-MULTIPLICATION

cross multiply

noun Mathematics.
to remove fractions from an equation by multiplying each side by the common multiple of the denominators of the fractions of the opposite side.

Origin:
1950–55

cross multiplication, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Cross-multiplication is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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