2) 3 5/8+2 7/16 4) 4 7/10+ 9 8/15 6) 6 3/10+5 11/12 8) 5 1/3-2 1/2

3 5/8  +  2 7/16 = 29/8  +  39/16 =(29 × 2  +  39 × 1)/16 = 58/16  +  39/16 =  97/16 = 6 1/16 4 7/10  +  9 8/15 = 47/10  +  143/15 =   (47 × 3  +  143 × 2)/30 = 141/30  +  286/30 =  427/30 = 14 7/30 6 3/10  +  5 11/12 = 63/10  +  71/12 =    (63 × 6  +  71 × 5)/60 = 378/60  +  355/60 =  733/60 = 12 13/60 5 1/3  -  2 1/2 = 16/3  -  5/2 =(16 × 2 - 5 × 3)/6 = 32/6 - 15/6 =  17/6 = 2 5/6