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how to add dissimilar fractions such as 4+2 3/4 =

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Jers15viz
First convert mixed fractions to improper fractions
2 3/4=11/4

Add them
4+11/4
Find their LCD, the LCD is the LCM of the denominator, the LCD is 4
16/4+11/4
=27/4

Hope this helps =)

Shaiferviz
change mixed number to improper fraction then get the 
LCD,then add the numerator and copy the denominator to get the final answer..