We divide 79173906 by 639
We want to divide 79173906 by 639.

On to step 1:
639 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 639

Moving on to step 2:
639 goes into 79 0 times with a remainder of 79.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 79 after subtracting 0 from 79.
Fetch the next digit (1) from the dividend, attach it to 79 and continue: 791 / 639

Step 3:
639 can be fit into 791 1 times, resulting in a remainder of 152.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 639 from 791 and we're left with 152.
Append the next digit (7) from the dividend to 152 and continue with: 1527 / 639

Going ahead to step 4:
1527 divided by 639 is 2 with a remainder of 249.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 1278 from 1527 leaves us with 249.
Bring next digit (3) of the dividend behind the 249 and repeat the process: 2493 / 639

Let's proceed to step 5:
639 can be fit into 2493 3 times, resulting in a remainder of 576.
Use 3 as the next digit of our solution. 
Result so far: 123.0
Subtract 1917 from 2493 to get 576.
Fetch the next digit (9) from the dividend, attach it to 576 and continue: 5769 / 639

Let's proceed to step 6:
639 goes into 5769 9 times with a remainder of 18.
The number 9 becomes the next digit in our result. 
Result so far: 1239.0
Subtracting 5751 from 5769 leaves us with 18.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 639

Advancing to step 7:
The number 639 fits into 180 0 times, leaving a remainder of 180.
The number 0 becomes the next digit in our result. 
Result so far: 12390.0
Subtracting 0 from 180 leaves us with 180.
Bring next digit (6) of the dividend behind the 180 and repeat the process: 1806 / 639

Moving on to step 8:
1806 divided by 639 is 2 with a remainder of 528.
Write down 2 as next digit of the result. 
Result so far: 123902.0
Deduct 1278 from 1806 and we're left with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Let's proceed to step 9:
639 can be fit into 5280 8 times, resulting in a remainder of 168.
The number 8 becomes the next digit in our result. 
Result so far: 123902.8
The remainder is 168 after subtracting 5112 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Advancing to step 10:
If we divide 1680 by 639, we get 2 and a remainder of 402.
The number 2 becomes the next digit in our result. 
Result so far: 123902.82
Subtracting 1278 from 1680 leaves us with 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Going ahead to step 11:
The number 639 fits into 4020 6 times, leaving a remainder of 186.
Use 6 as the next digit of our solution. 
Result so far: 123902.826
Subtract 3834 from 4020 to get 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Let's proceed to step 12:
639 can be fit into 1860 2 times, resulting in a remainder of 582.
The number 2 becomes the next digit in our result. 
Result so far: 123902.8262
If we take 1278 away from 1860, we end up with 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Let's proceed to step 13:
If we divide 5820 by 639, we get 9 and a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 123902.82629
If we subtract 5751 from 5820, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 14:
When dividing 690 by 639, we get 1 with a remainder of 51.
Write down 1 as next digit of the result. 
Result so far: 123902.826291
Subtracting 639 from 690 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 15:
When dividing 510 by 639, we get 0 with a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 123902.826291
If we subtract 0 from 510, we get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Step 16:
5100 divided by 639 is 7 with a remainder of 627.
Write down 7 as next digit of the result. 
Result so far: 123902.82629107
Subtracting 4473 from 5100 leaves us with 627.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6270, and continue the process.

The final outcome is 123902.82629107, with a leftover of 6.27e-07.