66439 divided by 91 
We want to figure out the number of times 66439 can be divided by 91.

Let's proceed to step 1:
91 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 91

Advancing to step 2:
When dividing 66 by 91, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (4) from the dividend after 66, then repeat: 664 / 91

Advancing to step 3:
When dividing 664 by 91, we get 7 with a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 637 from 664 and we're left with 27.
Fetch the next digit (3) from the dividend, attach it to 27 and continue: 273 / 91

Advancing to step 4:
273 divided by 91 is 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
Subtract 273 from 273 to get 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 91

Going ahead to step 5:
The number 91 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 730.0
Deduct 0 from 9 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 6:
91 goes into 90 0 times with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 730.0
If we take 0 away from 90, we end up with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 7:
91 can be fit into 900 9 times, resulting in a remainder of 81.
The number 9 becomes the next digit in our result. 
Result so far: 730.09
If we take 819 away from 900, we end up with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 8:
810 divided by 91 is 8 with a remainder of 82.
The next digit of our result is 8. 
Result so far: 730.098
If we take 728 away from 810, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 9:
91 can be fit into 820 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 730.0989
The remainder is 1 after subtracting 819 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 10:
91 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 730.0989
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 11:
91 can be fit into 100 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 730.098901
If we take 91 away from 100, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 12:
91 goes into 90 0 times with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 730.098901
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 13:
900 divided by 91 is 9 with a remainder of 81.
Use 9 as the next digit of our solution. 
Result so far: 730.09890109
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

In conclusion, the division gives 730.09890109 with a balance of 8.1e-08.