To subtract fractions with different denominators, you first have to find the equivalent fractions that have equal denominators. In this case, you can multiply top and bottom of 5/12 by 7 to give 35/84. You can multiply top and bottom of 4/7 by 12 to give 48/84. Thus the question can be rewritten as 35/84 - 48/84. This is just a straight subtraction which gives the answer -13/84
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2/3 minus 1/4 is 5/12
3/5 - 3/4 = 12/20 - 15/20 = (12 - 15)/20 = -3/20
It is: 12-12 = 0
6/12 - 4/16 is equal to 1/2 - 1/4 and that is equal to 1/4
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