Deesam1214go Deesam1214go Math Answered Add. Express final answers in simplest form. 1.) 3/12+5/12+7/12= 2.) 1 3/8+1/8= 3.) 2 7/12+2/12= 4.) 3/20+3 7/20+9/20= 5.) 8 2/10+4 1/10+7 3/10