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you change the denomoninator to the biggest number

It depends on what you are trying to do. To add or subtract the denominators need to be the same, so you need to change one or both fractions to equivalent fractions with the same denominator before adding or subtracting. To multiply, you just multiply the numerators and the denominators. To divide, take the fraction that you are diving by and flip it over and multiply just like you do for multiplication of two fractions.

Add or subtract: 1/2 + 1/3 = 3/6 +2/6 = 5/6

Multiply: 1/2 X 1/3 = 1/6

Divide: 1/2 / 1/3 = 1/2 X 3/1 = 3/2

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13y ago

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