621911 ÷ 45 
Let's see how many times 45 fits into 621911.

Advancing to step 1:
If we divide 6 by 45, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 45

On to step 2:
When dividing 62 by 45, we get 1 with a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 45 from 62, we get 17.
Take the next digit (1) from the dividend and append it to 17, then repeat: 171 / 45

Moving on to step 3:
45 goes into 171 3 times with a remainder of 36.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
If we take 135 away from 171, we end up with 36.
Fetch the next digit (9) from the dividend, attach it to 36 and continue: 369 / 45

Advancing to step 4:
369 divided by 45 is 8 with a remainder of 9.
The next digit of our result is 8. 
Result so far: 138.0
If we subtract 360 from 369, we get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 45

Going ahead to step 5:
45 can be fit into 91 2 times, resulting in a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 1382.0
The remainder is 1 after subtracting 90 from 91.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 45

Going ahead to step 6:
11 divided by 45 is 0 with a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 13820.0
If we subtract 0 from 11, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
The number 45 fits into 110 2 times, leaving a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 13820.2
The remainder is 20 after subtracting 90 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
The number 45 fits into 200 4 times, leaving a remainder of 20.
The next digit of our result is 4. 
Result so far: 13820.24
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
45 goes into 200 4 times with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 13820.244
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 13820.244, and the remainder is 0.002.