To get 3 5/6 - 4 5/12, you would have to get the denominators even. So 12 is the lowest, so lets use that. 3 5/6 - 4 5/12 3 10/12 - 4 5/12 3-4= -1 10-5= 5 Now, you have a -1 and a + 5/12, to do this you have to turn -1 into -12/12 -12/12 + 5/12 = -7/12 Your answer is -7/12 Hope this helped!