Answer:
I believe the smallest you can add is two, because 654 / 3 is 218.
Explanation:
652 / 3 = 217.333333333
653 / 3 = 217.666666667
654 / 3 = 218
2
652/3 = 217 1/3
Add 2 it becomes 654
654 / = 218
3.4m questions
4.3m answers