Let's divide 421939 by 39
We want to divide 421939 by 39.

Step 1:
When dividing 4 by 39, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 39

Moving on to step 2:
If we divide 42 by 39, we get 1 and a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 39 from 42 leaves us with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 39

Moving on to step 3:
If we divide 31 by 39, we get 0 and a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 31 and we're left with 31.
Take the next digit (9) from the dividend and append it to 31, then repeat: 319 / 39

Let's proceed to step 4:
If we divide 319 by 39, we get 8 and a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 108.0
If we subtract 312 from 319, we get 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 39

Step 5:
If we divide 73 by 39, we get 1 and a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 1081.0
The remainder is 34 after subtracting 39 from 73.
Take the next digit (9) from the dividend and append it to 34, then repeat: 349 / 39

Advancing to step 6:
When dividing 349 by 39, we get 8 with a remainder of 37.
The next digit of our result is 8. 
Result so far: 10818.0
If we subtract 312 from 349, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 7:
If we divide 370 by 39, we get 9 and a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 10818.9
Subtracting 351 from 370 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
190 divided by 39 is 4 with a remainder of 34.
Record the quotient 4 as the next digit in the result. 
Result so far: 10818.94
If we take 156 away from 190, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 9:
39 goes into 340 8 times with a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 10818.948
If we subtract 312 from 340, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 10:
280 divided by 39 is 7 with a remainder of 7.
The next digit of our result is 7. 
Result so far: 10818.9487
The remainder is 7 after subtracting 273 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 11:
39 goes into 70 1 times with a remainder of 31.
The next digit of our result is 1. 
Result so far: 10818.94871
The remainder is 31 after subtracting 39 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 12:
39 can be fit into 310 7 times, resulting in a remainder of 37.
Write down 7 as next digit of the result. 
Result so far: 10818.948717
Deduct 273 from 310 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 13:
When dividing 370 by 39, we get 9 with a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 10818.9487179
The remainder is 19 after subtracting 351 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 14:
The number 39 fits into 190 4 times, leaving a remainder of 34.
Put 4 as the next digit of the answer. 
Result so far: 10818.94871794
Subtract 156 from 190 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Our division results in 10818.94871794 with a remaining 3.4e-08.