We're dividing 621336 by 45 
We want to figure out the number of times 621336 can be divided by 45.

Step 1:
6 divided by 45 is 0 with a remainder of 6.
The next digit of our result is 0. 
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 / 45

Step 2:
When dividing 62 by 45, we get 1 with a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 17 after subtracting 45 from 62.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 45

Going ahead to step 3:
The number 45 fits into 171 3 times, leaving a remainder of 36.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtracting 135 from 171 leaves us with 36.
Include the next digit (3) from the dividend after 36, then repeat: 363 / 45

Going ahead to step 4:
363 divided by 45 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 138.0
If we take 360 away from 363, we end up with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 45

Advancing to step 5:
The number 45 fits into 33 0 times, leaving a remainder of 33.
Use 0 as the next digit of our solution. 
Result so far: 1380.0
Subtract 0 from 33 to get 33.
Append the next digit (6) from the dividend to 33 and continue with: 336 / 45

On to step 6:
When dividing 336 by 45, we get 7 with a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 13807.0
Deduct 315 from 336 and we're left 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 7:
The number 45 fits into 210 4 times, leaving a remainder of 30.
Record the quotient 4 as the next digit in the result. 
Result so far: 13807.4
Deduct 180 from 210 and we're left 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.

Let's proceed to step 8:
The number 45 fits into 300 6 times, leaving a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 13807.46
Deduct 270 from 300 and we're left 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.

Moving on to step 9:
45 can be fit into 300 6 times, resulting in a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 13807.466
Subtract 270 from 300 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 13807.466, with a leftover of 0.003.