ok so you start off making both of them a mixed number 4 3/4 would be 19/4 amd 2 2/3 would be 8/3 then find a common (same) denominator (bottom number) so 19/4 and 8/3 have a common denominator of 12 so whatever you do to the bottom number you do to the top so to get 19/4 to x/12 you have to multiply (4 x 3)=12. then you have to do the same with the top number so multiply 19 x 3=57 so 4 3/4 would now be 57/12 and 8/3 is gonna do the same thing and get 32/12 then when you do that you can do basic subtraction 57-32=25.Your final answer will be 25/12 which would be 2 and 1/12