3 1/3 + 5 1/6 = 3 2/6 + 5 1/6 = 8 3/6 = 8 1/2
1 1/2-2/5= 1 5/10 - 4/10 = 1 1/10
8 1/2 * 2/5 =17/2*2/5 = 17/5 = 3 2/5
2 3/4: 1 1/10= 11/4*10/11= 10/4=5/2= 2 1/2
3 2/5 - 2 1/2 = 3 4/10 - 2 5/10 = 2 14/10-2 5/10 = 9/10
