We look at the division of 129209 by 18 
We want to figure out the number of times 129209 can be divided by 18.

Moving on to step 1:
1 divided by 18 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 18

Advancing to step 2:
When dividing 12 by 18, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 18

Moving on to step 3:
129 divided by 18 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 126 from 129, we get 3.
Include the next digit (2) from the dividend after 3, then repeat: 32 / 18

Let's proceed to step 4:
If we divide 32 by 18, we get 1 and a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
Subtract 18 from 32 to get 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 18

Going ahead to step 5:
When dividing 140 by 18, we get 7 with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 717.0
Subtracting 126 from 140 leaves us with 14.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 18

Going ahead to step 6:
149 divided by 18 is 8 with a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 7178.0
Subtracting 144 from 149 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
When dividing 50 by 18, we get 2 with a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 7178.2
If we subtract 36 from 50, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
The number 18 fits into 140 7 times, leaving a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 7178.27
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 9:
If we divide 140 by 18, we get 7 and a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 7178.277
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 7178.277 with a remainder of 0.0014.