We're dividing 453420 by 45 
We want to figure out the number of times 453420 can be divided by 45.

Let's proceed to step 1:
When dividing 4 by 45, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 45

On to step 2:
45 divided by 45 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 45 from 45 and we're left with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 45

Moving on to step 3:
45 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 3 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 45

On to step 4:
34 divided by 45 is 0 with a remainder of 34.
Use 0 as the next digit of our solution. 
Result so far: 100.0
Subtract 0 from 34 to get 34.
Grab the next digit (2) from the dividend, add it to 34, then carry on: 342 / 45

On to step 5:
45 can be fit into 342 7 times, resulting in a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 1007.0
Deduct 315 from 342 and we're left with 27.
Take the next digit (0) from the dividend and append it to 27, then repeat: 270 / 45

On to step 6:
If we divide 270 by 45, we get 6 and a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 10076.0
Deduct 270 from 270 and we're left 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.

On to step 7:
The number 45 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10076.0
If we subtract 0 from 0, we 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.

Step 8:
0 divided by 45 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10076.0
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.

The final outcome is 10076.0, with a leftover of 0.0.