The mathematical justification for the method is from the following longer mathematical procedure. Multiply the numerator of the right hand fraction by the denominator of the left hand fraction.

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How does it work.

How do you cross multiply. Here is what that looks like. In practice the method of cross multiplying means that we multiply the numerator of each or one side by the denominator of the other side effectively crossing the terms over. Multiply the top and bottom of the first fraction by the bottom number of the second fraction.

Multiply the numerator of the second fraction by the denominator of the first fraction and jot down the answer. To cross multiply two fractions. Multiply the numerator of the first fraction by the denominator of the second fraction and jot down the answer.

20 8 10 x or 160 10x. 8 3 12 3 2 3. 8 3 12 3 2 12 3 12.

Well to cross multiply them you multiply the numerator in the first fraction by the denominator in the second fraction then write that number down. Multiply the top and bottom of the second fraction by the bottom number that the first fraction had. How to cross multiply cross multiplying with two of the same variable multiply the numerator of the left hand fraction by the denominator of the right hand fraction.

Multiply the numerator of the first number by the denominator of the second then the numerator of the second and denominator of the first and set the terms equal to each other. Divide both sides by 10 to get your answer. Then you multiply the numerator of the second fraction by the denominator of the first fraction.

Set the two products equal to each. Cross multiply 20 x 10 8.