2.1+0.2= 0.3+0.7= 3.6+1.6= 7.5-0.5=
2.13-0.02= 3.51+0.2= 102.03+5.3= 1.12-1.02=
4.5-0.01= 3.7-0.9= 0.9-0.32= 1.38-0.28=