421218 divided by 45 
Our goal is to divide 421218 by 45.

Moving on to step 1:
45 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 45

Let's proceed to step 2:
42 divided by 45 is 0 with a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Take the next digit (1) from the dividend and append it to 42, then repeat: 421 / 45

Step 3:
The number 45 fits into 421 9 times, leaving a remainder of 16.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtracting 405 from 421 leaves us with 16.
Bring next digit (2) of the dividend behind the 16 and repeat the process: 162 / 45

Advancing to step 4:
162 divided by 45 is 3 with a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 93.0
Subtracting 135 from 162 leaves us with 27.
Bring next digit (1) of the dividend behind the 27 and repeat the process: 271 / 45

Let's proceed to step 5:
45 can be fit into 271 6 times, resulting in a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 936.0
Deduct 270 from 271 and we're left with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 45

Step 6:
18 divided by 45 is 0 with a remainder of 18.
The next digit of our result is 0. 
Result so far: 9360.0
If we take 0 away from 18, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
45 can be fit into 180 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 9360.4
Subtracting 180 from 180 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:
If we divide 0 by 45, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 9360.4
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.

Going ahead to step 9:
45 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9360.4
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 outcome is 9360.4, with a leftover of 0.0.