Let's divide 431421 by 1
We want to divide 431421 by 1.

Moving on to step 1:
If we divide 4 by 1, we get 4 and a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 4 from 4, we get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 1

Going ahead to step 2:
1 can be fit into 3 3 times, resulting in a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 3 away from 3, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 1

Moving on to step 3:
The number 1 fits into 1 1 times, leaving a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 431.0
The remainder is 0 after subtracting 1 from 1.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 1

Advancing to step 4:
1 can be fit into 4 4 times, resulting in a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4314.0
If we subtract 4 from 4, we get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 1

Advancing to step 5:
1 goes into 2 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 43142.0
Subtract 2 from 2 to get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 1

Step 6:
If we divide 1 by 1, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 431421.0
If we take 1 away from 1, 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.

Advancing to step 7:
1 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 431421.0
Subtract 0 from 0 to 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.

Advancing to step 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 431421.0
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 result is 431421.0 with a remainder of 0.0.