3690 divided by 91 
We want to figure out the number of times 3690 can be divided by 91.

Advancing to step 1:
3 divided by 91 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 91

Step 2:
36 divided by 91 is 0 with a remainder of 36.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Append the next digit (9) from the dividend to 36 and continue with: 369 / 91

Advancing to step 3:
The number 91 fits into 369 4 times, leaving a remainder of 5.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 364 from 369, we get 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 91

On to step 4:
The number 91 fits into 50 0 times, leaving a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 40.0
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 5:
500 divided by 91 is 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 40.5
Subtracting 455 from 500 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 6:
When dividing 450 by 91, we get 4 with a remainder of 86.
Write down 4 as next digit of the result. 
Result so far: 40.54
The remainder is 86 after subtracting 364 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 7:
91 can be fit into 860 9 times, resulting in a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 40.549
Subtracting 819 from 860 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 8:
91 goes into 410 4 times with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 40.5494
If we take 364 away from 410, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 9:
91 goes into 460 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 40.54945
Subtract 455 from 460 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 10:
91 goes into 50 0 times with a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 40.54945
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 11:
91 can be fit into 500 5 times, resulting in a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 40.5494505
If we take 455 away from 500, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 12:
When dividing 450 by 91, we get 4 with a remainder of 86.
Write down 4 as next digit of the result. 
Result so far: 40.54945054
If we subtract 364 from 450, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Our division results in 40.54945054 with a remaining 8.6e-08.