We're dividing 816408 by 45 
Let's see how many times 45 fits into 816408.

Going ahead to step 1:
8 divided by 45 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 45

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
Deduct 45 from 81 and we're left with 36.
Fetch the next digit (6) from the dividend, attach it to 36 and continue: 366 / 45

Step 3:
If we divide 366 by 45, we get 8 and a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
If we take 360 away from 366, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 45

Advancing to step 4:
When dividing 64 by 45, we get 1 with a remainder of 19.
The next digit of our result is 1. 
Result so far: 181.0
If we subtract 45 from 64, we get 19.
Append the next digit (0) from the dividend to 19 and continue with: 190 / 45

Step 5:
The number 45 fits into 190 4 times, leaving a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 1814.0
Deduct 180 from 190 and we're left with 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 45

Step 6:
45 goes into 108 2 times with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 18142.0
Subtract 90 from 108 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 7:
45 goes into 180 4 times with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 18142.4
The remainder is 0 after subtracting 180 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
45 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 18142.4
The remainder is 0 after subtracting 0 from 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 9:
45 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 18142.4
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.

The final result is 18142.4 with a remainder of 0.0.