154937

First, you write the 3times table form 1-9 out. Then I wondered what times table from 3 would end in a one.7*3=21 so I carry the twenty to the ten's column. So now I know that e=1. Now you need to know what 3*d+2=7 3*5= 15+2= 17,
so d=5, and now you will also have to carry the ten to the hundred's column.
Now you need to now what is 3*c+1=5 8*3+1=25 so c=8. Now you need to now what 3*b+2=8 2*3+2=8. Now you need to now what 3*a=2 3*4=12. 3*1+1=4.
So the answer is 428571.