For mixed numbers, either deal with the whole number part and fraction part separately, then combine, or turn the mixed numbers into fractions.
Let's try dealing with the whole numbers and fractions separately.
2-5 = -3
3/8 - 3/4 | Find a LCD between 4 and 8, that's 8.
3/8 - 6/8 = -3/8
Combine: -3 + -3/8 = -3 and 3/8
Turn both to fractions:
2 and 3/8 = (8*2+3)/8 = 19/8
5 and 3/4 = (4*5+3)/4 = 23/4 | LCD is 8
19/8 - 46/8 = -27/8 = -3 and 3/8
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