9|129
How many times does 9 go into 1?
0 times how many times does 9 go into 12?
1 time so now you do this
12-9=3 so now you would bring the 9 down
how many times does 9 go into 129?
14 times so now you do this
129-125=4
and you now your numbers should say 14 and that is how you do long division hope i could help