We look at the division of 621980 by 4 
We want to divide 621980 by 4.

Moving on to step 1:
4 goes into 6 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
If we take 4 away from 6, we end up with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 4

Let's proceed to step 2:
The number 4 fits into 22 5 times, leaving a remainder of 2.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtract 20 from 22 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 4

Let's proceed to step 3:
4 can be fit into 21 5 times, resulting in a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 155.0
The remainder is 1 after subtracting 20 from 21.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 4

Advancing to step 4:
If we divide 19 by 4, we get 4 and a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 1554.0
Deduct 16 from 19 and we're left with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 4

Advancing to step 5:
4 goes into 38 9 times with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 15549.0
The remainder is 2 after subtracting 36 from 38.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 4

Going ahead to step 6:
The number 4 fits into 20 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 155495.0
If we take 20 away from 20, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
4 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 155495.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
4 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 155495.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 155495.0 with a remainder of 0.0.