We look at the division of 641987 by 91 
We're looking to find how many times 91 goes into 641987.

Let's proceed to step 1:
The number 91 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 91

Step 2:
When dividing 64 by 91, we get 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Bring next digit (1) of the dividend behind the 64 and repeat the process: 641 / 91

Going ahead to step 3:
91 goes into 641 7 times with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 637 from 641 leaves us with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 91

Moving on to step 4:
If we divide 49 by 91, we get 0 and a remainder of 49.
Record the quotient 0 as the next digit in the result. 
Result so far: 70.0
If we subtract 0 from 49, we get 49.
Grab the next digit (8) from the dividend, add it to 49, then carry on: 498 / 91

On to step 5:
If we divide 498 by 91, we get 5 and a remainder of 43.
The number 5 becomes the next digit in our result. 
Result so far: 705.0
Subtracting 455 from 498 leaves us with 43.
Grab the next digit (7) from the dividend, add it to 43, then carry on: 437 / 91

On to step 6:
If we divide 437 by 91, we get 4 and a remainder of 73.
The next digit of our result is 4. 
Result so far: 7054.0
If we subtract 364 from 437, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 7:
91 can be fit into 730 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 7054.8
Subtract 728 from 730 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
The number 91 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 7054.8
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
The number 91 fits into 200 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 7054.802
Deduct 182 from 200 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 10:
The number 91 fits into 180 1 times, leaving a remainder of 89.
Record the quotient 1 as the next digit in the result. 
Result so far: 7054.8021
If we subtract 91 from 180, we get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Going ahead to step 11:
91 goes into 890 9 times with a remainder of 71.
The next digit of our result is 9. 
Result so far: 7054.80219
If we subtract 819 from 890, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 12:
When dividing 710 by 91, we get 7 with a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 7054.802197
The remainder is 73 after subtracting 637 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 13:
91 goes into 730 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 7054.8021978
If we take 728 away from 730, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 14:
20 divided by 91 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 7054.8021978
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 7054.8021978 with a remaining 2e-08.