We look at the division of 79580193 by 646 
We want to figure out the number of times 79580193 can be divided by 646.

On to step 1:
7 divided by 646 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 646

On to step 2:
79 divided by 646 is 0 with a remainder of 79.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 79 and we're left with 79.
Grab the next digit (5) from the dividend, add it to 79, then carry on: 795 / 646

Moving on to step 3:
When dividing 795 by 646, we get 1 with a remainder of 149.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 149 after subtracting 646 from 795.
Fetch the next digit (8) from the dividend, attach it to 149 and continue: 1498 / 646

Going ahead to step 4:
646 goes into 1498 2 times with a remainder of 206.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 1292 from 1498, we get 206.
Include the next digit (0) from the dividend after 206, then repeat: 2060 / 646

Step 5:
646 goes into 2060 3 times with a remainder of 122.
Put 3 as the next digit of the answer. 
Result so far: 123.0
If we subtract 1938 from 2060, we get 122.
Fetch the next digit (1) from the dividend, attach it to 122 and continue: 1221 / 646

Moving on to step 6:
646 can be fit into 1221 1 times, resulting in a remainder of 575.
Use 1 as the next digit of our solution. 
Result so far: 1231.0
Subtracting 646 from 1221 leaves us with 575.
Include the next digit (9) from the dividend after 575, then repeat: 5759 / 646

Let's proceed to step 7:
The number 646 fits into 5759 8 times, leaving a remainder of 591.
Write down 8 as next digit of the result. 
Result so far: 12318.0
Subtracting 5168 from 5759 leaves us with 591.
Fetch the next digit (3) from the dividend, attach it to 591 and continue: 5913 / 646

Going ahead to step 8:
If we divide 5913 by 646, we get 9 and a remainder of 99.
Put 9 as the next digit of the answer. 
Result so far: 123189.0
Subtracting 5814 from 5913 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Moving on to step 9:
646 goes into 990 1 times with a remainder of 344.
The next digit of our result is 1. 
Result so far: 123189.1
The remainder is 344 after subtracting 646 from 990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

On to step 10:
646 goes into 3440 5 times with a remainder of 210.
The next digit of our result is 5. 
Result so far: 123189.15
Deduct 3230 from 3440 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

On to step 11:
646 can be fit into 2100 3 times, resulting in a remainder of 162.
Put 3 as the next digit of the answer. 
Result so far: 123189.153
Subtracting 1938 from 2100 leaves us with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Advancing to step 12:
646 goes into 1620 2 times with a remainder of 328.
The number 2 becomes the next digit in our result. 
Result so far: 123189.1532
The remainder is 328 after subtracting 1292 from 1620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Moving on to step 13:
When dividing 3280 by 646, we get 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 123189.15325
If we subtract 3230 from 3280, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 14:
646 goes into 500 0 times with a remainder of 500.
Write down 0 as next digit of the result. 
Result so far: 123189.15325
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Let's proceed to step 15:
When dividing 5000 by 646, we get 7 with a remainder of 478.
Use 7 as the next digit of our solution. 
Result so far: 123189.1532507
Subtracting 4522 from 5000 leaves us with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Going ahead to step 16:
646 goes into 4780 7 times with a remainder of 258.
Write down 7 as next digit of the result. 
Result so far: 123189.15325077
Deduct 4522 from 4780 and we're left with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

The final result is 123189.15325077 with a remainder of 2.58e-07.