1.
5/4 + 5/4 = (5+5)/4 = 10/4= 5/2 = (2*2+1)/2 = 2 1/2
5/6 + 4/6 = (5+4)/6 = 9/6 = 3/2 = (1*2 +1)/2 = 1 1/2
2.
3 1/4 = (3*4+1)/4 = 13/4
8 2/5 = (8*5 + 2)/5 = 42/5
3.
4/5 + 7/10 = (4*2)/(5*2) + 7/10 = 8/10 + 7/10 = (8+7)/10=
= 15/10 = 3/2 = 1 1/2
5/6 + 2/3 = 5/6 + (2*2)/(3*2) = 5/6 + 4/6 = 9/6 = 3/2 = 1 1/2