The mistake he makes is by saying 3/4 + 1/4 = 4/8
The denominators stay the same when adding fractions, and the denominators must be the same value.
So instead, he should have 3/4 + 1/4 = 4/4 = 1
Overall, 5 3/4 + 2 1/4 = 5+2+1 = 8
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