We divide 421989 by 39
Let's see how many times 39 fits into 421989.

On to step 1:
The number 39 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 39

Let's proceed to step 2:
39 goes into 42 1 times with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 39 from 42 and we're left with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 39

Advancing to step 3:
39 can be fit into 31 0 times, resulting in a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 31 after subtracting 0 from 31.
Bring next digit (9) of the dividend behind the 31 and repeat the process: 319 / 39

Moving on to step 4:
The number 39 fits into 319 8 times, leaving a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 108.0
Subtract 312 from 319 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 39

Advancing to step 5:
39 goes into 78 2 times with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 1082.0
Subtracting 78 from 78 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 39

Step 6:
When dividing 9 by 39, we get 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 10820.0
Deduct 0 from 9 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
If we divide 90 by 39, we get 2 and a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 10820.2
Deduct 78 from 90 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
120 divided by 39 is 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 10820.23
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 9:
30 divided by 39 is 0 with a remainder of 30.
The next digit of our result is 0. 
Result so far: 10820.23
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 10:
39 can be fit into 300 7 times, resulting in a remainder of 27.
Write down 7 as next digit of the result. 
Result so far: 10820.2307
Subtracting 273 from 300 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 11:
The number 39 fits into 270 6 times, leaving a remainder of 36.
The number 6 becomes the next digit in our result. 
Result so far: 10820.23076
Subtract 234 from 270 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 12:
39 goes into 360 9 times with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 10820.230769
The remainder is 9 after subtracting 351 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 13:
When dividing 90 by 39, we get 2 with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 10820.2307692
Deduct 78 from 90 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
The number 39 fits into 120 3 times, leaving a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 10820.23076923
If we take 117 away from 120, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 10820.23076923, with a leftover of 3e-09.