13-3.9 = 56.2-7.86= 15.8+6.28=
7.5 -4.3 =
2.18+6.72=
13.5-1.5=
0.47 +6=
9.6 -3.5 =
6.3+3.6=
0.95-0.32 =
2.4+7.3=
