(9×5+1)×0=0
It is 0.
-7510 is the smallest.
If 0 can be counted as the first number, then the smallest number is 01358. If 0 cannot be counted as the first number, the the smallest number is 10358.
0. The product, with any domino containing a 0 must be 0.
1059
1
6 (or 0)
1023456789
0
1023
2
0.