We look at the division of 840072 by 45 
We want to divide 840072 by 45.

Advancing to step 1:
If we divide 8 by 45, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 45

Advancing to step 2:
84 divided by 45 is 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 45 away from 84, we end up with 39.
Grab the next digit (0) from the dividend, add it to 39, then carry on: 390 / 45

On to step 3:
If we divide 390 by 45, we get 8 and a remainder of 30.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we take 360 away from 390, we end up with 30.
Fetch the next digit (0) from the dividend, attach it to 30 and continue: 300 / 45

Moving on to step 4:
When dividing 300 by 45, we get 6 with a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 186.0
The remainder is 30 after subtracting 270 from 300.
Bring next digit (7) of the dividend behind the 30 and repeat the process: 307 / 45

Advancing to step 5:
45 can be fit into 307 6 times, resulting in a remainder of 37.
The number 6 becomes the next digit in our result. 
Result so far: 1866.0
The remainder is 37 after subtracting 270 from 307.
Include the next digit (2) from the dividend after 37, then repeat: 372 / 45

Step 6:
If we divide 372 by 45, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 18668.0
The remainder is 12 after subtracting 360 from 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
45 can be fit into 120 2 times, resulting in a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 18668.2
The remainder is 30 after subtracting 90 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead 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: 18668.26
If we subtract 270 from 300, we 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.

Let's proceed to step 9:
The number 45 fits into 300 6 times, leaving a remainder of 30.
The next digit of our result is 6. 
Result so far: 18668.266
Subtracting 270 from 300 leaves us 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.

After the division, we end up with 18668.266 and a remainder of 0.003.