3/25-0.12=0

1/7-0.1=3/70

0.6-7/20=1/4

1/10-1/11=1/110

1/2+0.05=0.55

8/25-0.2=3/25

0.7+1/5=0.9

3/4-0.15=0.5

19/50+0.02=0.4

4/5+0.3=1. 1/10

0.45-1/4=0.2

1/20+0.25=0.3

1/8-1/9=1/72

13/20+0.4=1.1/20