Solve. The following decimal number operations.


1 a. 1.2 + ______ = 1.8


1 b. 3.9 + ______ = 7.47



2 a. ______ + 3.8 = 7.9


2 b. ______ + 0.36 = 0.36



3 a. 1.2 + ______ = 4.1


3 b. ______ + 0.63 = 6.33



4 a. 4.1 + ______ = 7.68


4 b. ______ + 0.9 = 3.8



5 a. 5.1 + ______ = 5.98


5 b. 3.1 + ______ = 4.3



6 a. 0.7 + ______ = 1.3