Let's divide 840640 by 91
We want to figure out the number of times 840640 can be divided by 91.

Moving on to step 1:
91 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 91

On to step 2:
91 can be fit into 84 0 times, resulting in a remainder of 84.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 84 to get 84.
Take the next digit (0) from the dividend and append it to 84, then repeat: 840 / 91

On to step 3:
If we divide 840 by 91, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 21 after subtracting 819 from 840.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 91

On to step 4:
91 can be fit into 216 2 times, resulting in a remainder of 34.
Use 2 as the next digit of our solution. 
Result so far: 92.0
If we subtract 182 from 216, we get 34.
Grab the next digit (4) from the dividend, add it to 34, then carry on: 344 / 91

Step 5:
The number 91 fits into 344 3 times, leaving a remainder of 71.
Put 3 as the next digit of the answer. 
Result so far: 923.0
If we take 273 away from 344, we end up with 71.
Fetch the next digit (0) from the dividend, attach it to 71 and continue: 710 / 91

Advancing to step 6:
91 can be fit into 710 7 times, resulting in a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 9237.0
Deduct 637 from 710 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 7:
When dividing 730 by 91, we get 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 9237.8
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.

Going ahead to step 8:
The number 91 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 9237.8
Deduct 0 from 20 and we're left 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.

Moving on to step 9:
91 goes into 200 2 times with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 9237.802
The remainder is 18 after subtracting 182 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 10:
When dividing 180 by 91, we get 1 with a remainder of 89.
The number 1 becomes the next digit in our result. 
Result so far: 9237.8021
If we take 91 away from 180, we end up with 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 number 9 becomes the next digit in our result. 
Result so far: 9237.80219
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 12:
If we divide 710 by 91, we get 7 and a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 9237.802197
If we subtract 637 from 710, 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.

Step 13:
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: 9237.8021978
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.

Advancing to step 14:
If we divide 20 by 91, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 9237.8021978
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.

In conclusion, the division gives 9237.8021978 with a balance of 2e-08.