We look at the division of 621543 by 91 
We're looking to find how many times 91 goes into 621543.

Let's proceed to step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 91

Moving on to step 2:
91 can be fit into 62 0 times, resulting in a remainder of 62.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 62 to get 62.
Grab the next digit (1) from the dividend, add it to 62, then carry on: 621 / 91

Moving on to step 3:
If we divide 621 by 91, we get 6 and a remainder of 75.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 546 from 621 to get 75.
Fetch the next digit (5) from the dividend, attach it to 75 and continue: 755 / 91

Going ahead to step 4:
The number 91 fits into 755 8 times, leaving a remainder of 27.
Write down 8 as next digit of the result. 
Result so far: 68.0
If we take 728 away from 755, we end up with 27.
Append the next digit (4) from the dividend to 27 and continue with: 274 / 91

Let's proceed to step 5:
The number 91 fits into 274 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 683.0
Subtracting 273 from 274 leaves us with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 91

Advancing to step 6:
If we divide 13 by 91, we get 0 and a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 6830.0
If we subtract 0 from 13, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
If we divide 130 by 91, we get 1 and a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 6830.1
The remainder is 39 after subtracting 91 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 8:
91 can be fit into 390 4 times, resulting in a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 6830.14
Deduct 364 from 390 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 9:
If we divide 260 by 91, we get 2 and a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 6830.142
Subtract 182 from 260 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 10:
780 divided by 91 is 8 with a remainder of 52.
The next digit of our result is 8. 
Result so far: 6830.1428
Deduct 728 from 780 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 11:
If we divide 520 by 91, we get 5 and a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 6830.14285
Subtracting 455 from 520 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 12:
If we divide 650 by 91, we get 7 and a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 6830.142857
If we subtract 637 from 650, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 13:
When dividing 130 by 91, we get 1 with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 6830.1428571
The remainder is 39 after subtracting 91 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 14:
The number 91 fits into 390 4 times, leaving a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 6830.14285714
Deduct 364 from 390 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final result is 6830.14285714 with a remainder of 2.6e-08.