We look at the division of 668090 by 91 
We want to divide 668090 by 91.

Step 1:
When dividing 6 by 91, we get 0 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

Let's proceed to step 2:
If we divide 66 by 91, we get 0 and a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Append the next digit (8) from the dividend to 66 and continue with: 668 / 91

Let's proceed to step 3:
668 divided by 91 is 7 with a remainder of 31.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 637 from 668 to get 31.
Bring next digit (0) of the dividend behind the 31 and repeat the process: 310 / 91

Going ahead to step 4:
91 goes into 310 3 times with a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
Subtracting 273 from 310 leaves us with 37.
Bring next digit (9) of the dividend behind the 37 and repeat the process: 379 / 91

Let's proceed to step 5:
91 can be fit into 379 4 times, resulting in a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 734.0
The remainder is 15 after subtracting 364 from 379.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 91

On to step 6:
91 goes into 150 1 times with a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 7341.0
If we subtract 91 from 150, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 7:
The number 91 fits into 590 6 times, leaving a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 7341.6
Subtracting 546 from 590 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 8:
The number 91 fits into 440 4 times, leaving a remainder of 76.
The next digit of our result is 4. 
Result so far: 7341.64
The remainder is 76 after subtracting 364 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 9:
When dividing 760 by 91, we get 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 7341.648
The remainder is 32 after subtracting 728 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 10:
The number 91 fits into 320 3 times, leaving a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 7341.6483
If we take 273 away from 320, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
When dividing 470 by 91, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 7341.64835
If we subtract 455 from 470, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 12:
When dividing 150 by 91, we get 1 with a remainder of 59.
Write down 1 as next digit of the result. 
Result so far: 7341.648351
If we subtract 91 from 150, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 13:
91 can be fit into 590 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 7341.6483516
If we take 546 away from 590, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 14:
91 can be fit into 440 4 times, resulting in a remainder of 76.
The next digit of our result is 4. 
Result so far: 7341.64835164
Deduct 364 from 440 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

In conclusion, the division gives 7341.64835164 with a balance of 7.6e-08.