91639986 ÷ 321 
We're looking to find how many times 321 goes into 91639986.

On to step 1:
The number 321 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 321

On to step 2:
321 can be fit into 91 0 times, resulting in a remainder of 91.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 91 after subtracting 0 from 91.
Fetch the next digit (6) from the dividend, attach it to 91 and continue: 916 / 321

Going ahead to step 3:
321 goes into 916 2 times with a remainder of 274.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 642 from 916 leaves us with 274.
Fetch the next digit (3) from the dividend, attach it to 274 and continue: 2743 / 321

Step 4:
321 can be fit into 2743 8 times, resulting in a remainder of 175.
Write down 8 as next digit of the result. 
Result so far: 28.0
Deduct 2568 from 2743 and we're left with 175.
Include the next digit (9) from the dividend after 175, then repeat: 1759 / 321

Advancing to step 5:
1759 divided by 321 is 5 with a remainder of 154.
Write down 5 as next digit of the result. 
Result so far: 285.0
Deduct 1605 from 1759 and we're left with 154.
Fetch the next digit (9) from the dividend, attach it to 154 and continue: 1549 / 321

Step 6:
1549 divided by 321 is 4 with a remainder of 265.
Write down 4 as next digit of the result. 
Result so far: 2854.0
If we subtract 1284 from 1549, we get 265.
Append the next digit (8) from the dividend to 265 and continue with: 2658 / 321

Advancing to step 7:
321 can be fit into 2658 8 times, resulting in a remainder of 90.
Write down 8 as next digit of the result. 
Result so far: 28548.0
Subtract 2568 from 2658 to get 90.
Grab the next digit (6) from the dividend, add it to 90, then carry on: 906 / 321

Let's proceed to step 8:
321 goes into 906 2 times with a remainder of 264.
Record the quotient 2 as the next digit in the result. 
Result so far: 285482.0
If we subtract 642 from 906, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Advancing to step 9:
The number 321 fits into 2640 8 times, leaving a remainder of 72.
The number 8 becomes the next digit in our result. 
Result so far: 285482.8
Subtract 2568 from 2640 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 10:
321 can be fit into 720 2 times, resulting in a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 285482.82
If we take 642 away from 720, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 11:
When dividing 780 by 321, we get 2 with a remainder of 138.
The number 2 becomes the next digit in our result. 
Result so far: 285482.822
Deduct 642 from 780 and we're left with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

After the division, we end up with 285482.822 and a remainder of 0.0138.