We look at the division of 813600 by 45 
We want to figure out the number of times 813600 can be divided by 45.

Step 1:
The number 45 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 45

Let's proceed to step 2:
81 divided by 45 is 1 with a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 36 after subtracting 45 from 81.
Take the next digit (3) from the dividend and append it to 36, then repeat: 363 / 45

On to step 3:
363 divided by 45 is 8 with a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
If we subtract 360 from 363, we get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 45

On to step 4:
45 can be fit into 36 0 times, resulting in a remainder of 36.
The next digit of our result is 0. 
Result so far: 180.0
Subtracting 0 from 36 leaves us with 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 45

Going ahead to step 5:
When dividing 360 by 45, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 1808.0
If we subtract 360 from 360, we get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 45

On to step 6:
When dividing 0 by 45, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 18080.0
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.

Advancing to step 7:
45 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 18080.0
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.

Advancing to step 8:
When dividing 0 by 45, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 18080.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 18080.0 with a remaining 0.0.