3 3/4+1 1/4= 4 3+2/4= 4 5/4= 5 1/4
2 5/6- 1 5/12 = 1 10-5/12 = 1 5/12
4-1 2/3= 3 3/3 - 1 2/3= 2 3-2/3=2 1/3
3 2/7- 6/5= 2 35+10-42/35=2 45-42/35=2 3/35
1 1/3*4= 4/3*4/1=16/3=5 1/3
3 1/4*2/5=13/4*2/5=13/10=1 3/10
2 1/4 : 3= 9/4:3/1= 9*1/4*3=3/4
20:2 1/2=20/1:5/2=20*2/1*5=8/1=8