Treat the "numbers" as unknowns added to each other (kids know how to add).

0=1; 6=1; 9=1;

1=00; 2=0; 3=0; 5=0; 7=0;

There is no 4 (which isn't part of the question any way), so that leave 8. 2*8=4 and 8=3-1 and 8=