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Published byBrianna Bird Modified over 2 years ago

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Finding a Common Denominator : : 3,6,9,12,15,18… 5,10,15,20,25,30… Now you have found the LCM. First you need to find the LCM. Now you need to list the multiples for each number.

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Finding a Common Denominator Your LCM is now your CD for the addition Problem. Use the factor that brought you to your multiple on the numerator. Now apply the same rule for the bottom fraction. X 5 X 3 Multiple across to find your new equivalent fraction. = = = = 5 6 Time to add the fractions.

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The denominator will be the same. Finding a Common Denominator X 5 X 3 = = = = Use addition on the numerators. It doesnt get any easier than that.

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