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3/4 and 3/8 have to have equal denominators, so multiply 3/4 by 2/2 because it's equal to one, so it doesn't change the value of the fraction, but it makes the denominator (the number on the bottom) bigger.3/4 x 2/2 = 6/8Now subtract.6/8 - 3/8 = 3/8Don't subtract the denominators.3/8 can't be simplified....