312399 divided by 79 
We want to figure out the number of times 312399 can be divided by 79.

Let's proceed to step 1:
When dividing 3 by 79, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 79

On to step 2:
If we divide 31 by 79, we get 0 and a remainder of 31.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Bring next digit (2) of the dividend behind the 31 and repeat the process: 312 / 79

Let's proceed to step 3:
The number 79 fits into 312 3 times, leaving a remainder of 75.
The next digit of our result is 3. 
Result so far: 3.0
If we take 237 away from 312, we end up with 75.
Grab the next digit (3) from the dividend, add it to 75, then carry on: 753 / 79

Let's proceed to step 4:
The number 79 fits into 753 9 times, leaving a remainder of 42.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtracting 711 from 753 leaves us with 42.
Grab the next digit (9) from the dividend, add it to 42, then carry on: 429 / 79

Going ahead to step 5:
79 can be fit into 429 5 times, resulting in a remainder of 34.
Write down 5 as next digit of the result. 
Result so far: 395.0
If we subtract 395 from 429, we get 34.
Include the next digit (9) from the dividend after 34, then repeat: 349 / 79

On to step 6:
If we divide 349 by 79, we get 4 and a remainder of 33.
Put 4 as the next digit of the answer. 
Result so far: 3954.0
The remainder is 33 after subtracting 316 from 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 7:
330 divided by 79 is 4 with a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 3954.4
If we take 316 away from 330, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
79 can be fit into 140 1 times, resulting in a remainder of 61.
The number 1 becomes the next digit in our result. 
Result so far: 3954.41
If we take 79 away from 140, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 9:
79 can be fit into 610 7 times, resulting in a remainder of 57.
Use 7 as the next digit of our solution. 
Result so far: 3954.417
Subtracting 553 from 610 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 10:
The number 79 fits into 570 7 times, leaving a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 3954.4177
Subtract 553 from 570 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

After the division, we end up with 3954.4177 and a remainder of 0.00017.