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How do you add fractions with different denominators

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Find a common denominator
If 2/4 + 1/8 then the common denominator is 8 you multiply the top and bottom of 2/4 by 2 changing it to 4/8 then your final answer is 5/8

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Thanks lauren, now i can finish my math homework!!!!!!!!!
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Find the common denominator

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1/2+ 1/4 what is the lowest number that, both two and four goes into? It's eight, so, now you divide two into eight= four, do 1/2 = 4/8...... Do the same with 1/4..... It's 2/8 see??? Now you have common fractions.....
4/8+ 2/8= 6/8.... Now reduce to 3/8.
TA DA!!!!
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To add fraction with different denominators, you find a common denominator. This will now help you to get common denominator to make the addition work simple. Get worked out examples on http://www.mathplayground.com/fractions_add.html.

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You find the GCF and then multiply the numerator by the number of times the numerator goes into the denominator.