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 Everyday Examples
 Common Denominator:  A whole number that is a common multiple of the denominators of two or more fractions.

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When cooking a couple of recipes, you may need to use the same ingredient more than once. To make sure that you have enough of the ingredient at home, you will need to add the quantities together. For example, you may need 3/4 cup of sugar and 1/2 cup of sugar. Adding these fractions requires you to find a common demoninator, which in this case will be 4. So the total amount needed would become 3/4 + 2/4 = 5/4 or 1 1/4 cups of sugar. Notice that the 1/2 was rewritten as 2/4 so the sum of the two quantities could be found.