621979 ÷ 31 
Our goal is to divide 621979 by 31.

Advancing to step 1:
The number 31 fits into 6 0 times, leaving 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.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 31

Advancing to step 2:
The number 31 fits into 62 2 times, leaving a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 62 away from 62, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 31

On to step 3:
31 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 31

Moving on to step 4:
19 divided by 31 is 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 200.0
If we subtract 0 from 19, we get 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 31

Advancing to step 5:
If we divide 197 by 31, we get 6 and a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 2006.0
If we subtract 186 from 197, we get 11.
Grab the next digit (9) from the dividend, add it to 11, then carry on: 119 / 31

Advancing to step 6:
If we divide 119 by 31, we get 3 and a remainder of 26.
Write down 3 as next digit of the result. 
Result so far: 20063.0
Subtracting 93 from 119 leaves us 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 7:
The number 31 fits into 260 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 20063.8
Subtract 248 from 260 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
31 goes into 120 3 times with a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 20063.83
Subtracting 93 from 120 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 9:
The number 31 fits into 270 8 times, leaving a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 20063.838
Subtract 248 from 270 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 10:
The number 31 fits into 220 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 20063.8387
The remainder is 3 after subtracting 217 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 11:
31 can be fit into 30 0 times, resulting in a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 20063.8387
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 12:
31 goes into 300 9 times with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 20063.838709
Subtracting 279 from 300 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 13:
31 can be fit into 210 6 times, resulting in a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 20063.8387096
The remainder is 24 after subtracting 186 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 14:
240 divided by 31 is 7 with a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 20063.83870967
The remainder is 23 after subtracting 217 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final outcome is 20063.83870967, with a leftover of 2.3e-08.