307*8=2456

703*8=5624

407*8=3256

704*8=5632

First of all, the 0 in the middle is the breakthrough point.

This formula is divided into two parts with 0: mouth * mouth = mouth and mouth * mouth = mouth.

Now determine the second factor. 2, 3 is impossible, because it must be 2 digits after multiplication, and the first digit is at least 4 digits ... obviously impossible.

5 is also not allowed. Because 5* is an arbitrary number, the unit of the result can only be 0 or 5.

6 is equally impossible. Because there is no room for that 8 (3 * 6 = 18, 6 * 8 = 48, the former has no 1, and the latter 8 needs two).

Seven is not good either. Because 5 must be ten digits at this time, it can only be 7 * 8 = 56, and the remaining digits 2, 3 and 4 cannot be filled in.

There are only eight left in the end.

Then determine the first factor.

7 can only be the first factor, because 7 can't be one or ten.

7*8=56

There are only two, three and four left. There are two filling methods: 3 * 8 = 24 and 4 * 8 = 32.

So one * * * four filling methods:

307*8=2456

703*8=5624

407*8=3256

704*8=5632

It should be detailed enough ~ ~ hehe