7.2 + (-3.4) =
4.1 + 5.3 =
7.2 + 3.4 =
-4.1 + (-5.3) =
-4.1 + 5.3 =
4.1 + (-5.3) =
-7.2 + 3.4 =
-7.2 + (-3.4) =
-1.2
3.8
1.2
-9.4
-3.8
-10.6
10.4
9.4
