663426 divided by 91 
We want to figure out the number of times 663426 can be divided by 91.

Step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 91

Going ahead to step 2:
The number 91 fits into 66 0 times, leaving a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Bring next digit (3) of the dividend behind the 66 and repeat the process: 663 / 91

Going ahead to step 3:
91 can be fit into 663 7 times, resulting in a remainder of 26.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 637 from 663 and we're left with 26.
Bring next digit (4) of the dividend behind the 26 and repeat the process: 264 / 91

Let's proceed to step 4:
264 divided by 91 is 2 with a remainder of 82.
The next digit of our result is 2. 
Result so far: 72.0
Subtract 182 from 264 to get 82.
Grab the next digit (2) from the dividend, add it to 82, then carry on: 822 / 91

Moving on to step 5:
If we divide 822 by 91, we get 9 and a remainder of 3.
The next digit of our result is 9. 
Result so far: 729.0
Deduct 819 from 822 and we're left with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 91

Let's proceed to step 6:
36 divided by 91 is 0 with a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 7290.0
The remainder is 36 after subtracting 0 from 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 7:
360 divided by 91 is 3 with a remainder of 87.
The next digit of our result is 3. 
Result so far: 7290.3
The remainder is 87 after subtracting 273 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 8:
When dividing 870 by 91, we get 9 with a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 7290.39
Deduct 819 from 870 and we're left 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.

Moving on to step 9:
If we divide 510 by 91, we get 5 and a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 7290.395
If we subtract 455 from 510, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 10:
91 goes into 550 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 7290.3956
Deduct 546 from 550 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
40 divided by 91 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 7290.3956
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 12:
91 goes into 400 4 times with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 7290.395604
Subtracting 364 from 400 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
The number 91 fits into 360 3 times, leaving a remainder of 87.
Write down 3 as next digit of the result. 
Result so far: 7290.3956043
Subtracting 273 from 360 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 14:
The number 91 fits into 870 9 times, leaving a remainder of 51.
Put 9 as the next digit of the answer. 
Result so far: 7290.39560439
If we take 819 away from 870, we end up 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.

Our division results in 7290.39560439 with a remaining 5.1e-08.