We're dividing 121839 by 18 
Let's see how many times 18 fits into 121839.

Let's proceed to step 1:
The number 18 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 18

Let's proceed 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
The remainder is 12 after subtracting 0 from 12.
Fetch the next digit (1) from the dividend, attach it to 12 and continue: 121 / 18

Moving on to step 3:
18 goes into 121 6 times with a remainder of 13.
The next digit of our result is 6. 
Result so far: 6.0
If we take 108 away from 121, we end up with 13.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 18

On to step 4:
If we divide 138 by 18, we get 7 and a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 67.0
If we take 126 away from 138, we end up with 12.
Append the next digit (3) from the dividend to 12 and continue with: 123 / 18

Moving on to step 5:
18 can be fit into 123 6 times, resulting in a remainder of 15.
Record the quotient 6 as the next digit in the result. 
Result so far: 676.0
Subtract 108 from 123 to get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 18

On to step 6:
If we divide 159 by 18, we get 8 and a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 6768.0
If we subtract 144 from 159, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
18 goes into 150 8 times with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 6768.8
If we take 144 away from 150, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
18 can be fit into 60 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 6768.83
Deduct 54 from 60 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
18 goes into 60 3 times with a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 6768.833
The remainder is 6 after subtracting 54 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The quotient of the division is 6768.833, and the remainder is 0.0006.