There are an infinite number of solutions to this question. Different possibilities include:
67 + 0.8
60 + 7.8
54 + 13.8
28.5 + 39.3
234 + 678 = 912
789 + 678 = 1467
678 + 75 = 753
567 + 678 = 1,245
9 plus 2 plus 2 plus 45-678 is equal to -620.
2222900
777
267
707.000999
678
3665
562,864