We're dividing 805090 by 45 
We want to figure out the number of times 805090 can be divided by 45.

On to step 1:
The number 45 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 45

Going ahead to step 2:
If we divide 80 by 45, we get 1 and a remainder of 35.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 35 after subtracting 45 from 80.
Include the next digit (5) from the dividend after 35, then repeat: 355 / 45

Advancing to step 3:
When dividing 355 by 45, we get 7 with a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtract 315 from 355 to get 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 45

On to step 4:
If we divide 400 by 45, we get 8 and a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 178.0
The remainder is 40 after subtracting 360 from 400.
Grab the next digit (9) from the dividend, add it to 40, then carry on: 409 / 45

Let's proceed to step 5:
45 can be fit into 409 9 times, resulting in a remainder of 4.
The next digit of our result is 9. 
Result so far: 1789.0
The remainder is 4 after subtracting 405 from 409.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 45

Let's proceed to step 6:
45 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 17890.0
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 7:
The number 45 fits into 400 8 times, leaving a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 17890.8
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
45 can be fit into 400 8 times, resulting in a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 17890.88
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The quotient of the division is 17890.88, and the remainder is 0.04.