well first lets switch to proper fractions
3 and 3/8 = 27/8
5 and 3/4 = 23/4
Greatest common multiple is 8
so 23/4 = 46/8
Now we can add the 2 fractions
46/8 + 27/8 = 73/8 or 9 and 1/8
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5/8
The common denominator of 5/8 and 3/4 is 32.The lowest common denominator (LCD) is 8.The highest common denominator (HCD) is 32.
5/8ths
11/12 + 3/4=11/12 + 9/12= 20/12=5/3
42/8, or 5 and 1 fourth