Well you first must get the fractions to have the same denominator. So you multiply 5/8 by 10 ( both top and bottom ) to get 50/80, and you multiply 7/10 by 8 to get 56/80. You ignore the whole 2 for now for it is not a fraction, and you add 56 plus 50 to get 106 and put it back over 80. 106/80, now since 106/80 is over 1 you can take 106 - 80 and get 26. 1 and 26/80 is what the two fractions add up to. Add the whole two to 1 and get 3 and 26/80 which can be simplified to 3 and 13/40.