Let's divide 39975373 by 39
We're looking to find how many times 39 goes into 39975373.

Advancing to step 1:
If we divide 3 by 39, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 39

Advancing to step 2:
When dividing 39 by 39, we get 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 39 from 39, we get 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 39

Going ahead to step 3:
The number 39 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we subtract 0 from 9, we get 9.
Include the next digit (7) from the dividend after 9, then repeat: 97 / 39

Going ahead to step 4:
97 divided by 39 is 2 with a remainder of 19.
The next digit of our result is 2. 
Result so far: 102.0
Subtract 78 from 97 to get 19.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 39

On to step 5:
When dividing 195 by 39, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 1025.0
Deduct 195 from 195 and we're left with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 39

Let's proceed to step 6:
3 divided by 39 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 10250.0
If we subtract 0 from 3, we get 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 39

Let's proceed to step 7:
37 divided by 39 is 0 with a remainder of 37.
Record the quotient 0 as the next digit in the result. 
Result so far: 102500.0
Subtract 0 from 37 to get 37.
Append the next digit (3) from the dividend to 37 and continue with: 373 / 39

On to step 8:
If we divide 373 by 39, we get 9 and a remainder of 22.
Put 9 as the next digit of the answer. 
Result so far: 1025009.0
The remainder is 22 after subtracting 351 from 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 9:
When dividing 220 by 39, we get 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 1025009.5
Subtract 195 from 220 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 10:
250 divided by 39 is 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 1025009.56
Subtracting 234 from 250 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
The number 39 fits into 160 4 times, leaving a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 1025009.564
Subtract 156 from 160 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
39 goes into 40 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 1025009.5641
Subtract 39 from 40 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
39 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 1025009.5641
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
The number 39 fits into 100 2 times, leaving a remainder of 22.
Use 2 as the next digit of our solution. 
Result so far: 1025009.564102
Subtract 78 from 100 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 15:
220 divided by 39 is 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 1025009.5641025
Subtracting 195 from 220 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 16:
39 goes into 250 6 times with a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 1025009.56410256
Deduct 234 from 250 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 1025009.56410256, with a leftover of 1.6e-08.