79452439 ÷ 399 
We want to divide 79452439 by 399.

Step 1:
If we divide 7 by 399, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 399

Let's proceed to step 2:
When dividing 79 by 399, we get 0 with a remainder of 79.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 79, we get 79.
Bring next digit (4) of the dividend behind the 79 and repeat the process: 794 / 399

On to step 3:
The number 399 fits into 794 1 times, leaving a remainder of 395.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 399 from 794 leaves us with 395.
Take the next digit (5) from the dividend and append it to 395, then repeat: 3955 / 399

Let's proceed to step 4:
If we divide 3955 by 399, we get 9 and a remainder of 364.
Put 9 as the next digit of the answer. 
Result so far: 19.0
Deduct 3591 from 3955 and we're left with 364.
Fetch the next digit (2) from the dividend, attach it to 364 and continue: 3642 / 399

Advancing to step 5:
399 can be fit into 3642 9 times, resulting in a remainder of 51.
The next digit of our result is 9. 
Result so far: 199.0
Subtract 3591 from 3642 to get 51.
Fetch the next digit (4) from the dividend, attach it to 51 and continue: 514 / 399

Going ahead to step 6:
399 can be fit into 514 1 times, resulting in a remainder of 115.
Use 1 as the next digit of our solution. 
Result so far: 1991.0
Subtract 399 from 514 to get 115.
Include the next digit (3) from the dividend after 115, then repeat: 1153 / 399

On to step 7:
399 can be fit into 1153 2 times, resulting in a remainder of 355.
Use 2 as the next digit of our solution. 
Result so far: 19912.0
Subtract 798 from 1153 to get 355.
Grab the next digit (9) from the dividend, add it to 355, then carry on: 3559 / 399

Step 8:
When dividing 3559 by 399, we get 8 with a remainder of 367.
Use 8 as the next digit of our solution. 
Result so far: 199128.0
Subtracting 3192 from 3559 leaves us with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Moving on to step 9:
3670 divided by 399 is 9 with a remainder of 79.
Write down 9 as next digit of the result. 
Result so far: 199128.9
Deduct 3591 from 3670 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Advancing to step 10:
399 can be fit into 790 1 times, resulting in a remainder of 391.
Use 1 as the next digit of our solution. 
Result so far: 199128.91
If we subtract 399 from 790, we get 391.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

On to step 11:
The number 399 fits into 3910 9 times, leaving a remainder of 319.
The next digit of our result is 9. 
Result so far: 199128.919
If we take 3591 away from 3910, we end up with 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

On to step 12:
3190 divided by 399 is 7 with a remainder of 397.
Put 7 as the next digit of the answer. 
Result so far: 199128.9197
If we subtract 2793 from 3190, we get 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

Advancing to step 13:
399 can be fit into 3970 9 times, resulting in a remainder of 379.
The number 9 becomes the next digit in our result. 
Result so far: 199128.91979
If we subtract 3591 from 3970, we get 379.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

Step 14:
The number 399 fits into 3790 9 times, leaving a remainder of 199.
The next digit of our result is 9. 
Result so far: 199128.919799
Subtract 3591 from 3790 to get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

The final outcome is 199128.919799, with a leftover of 1.99e-05.