We divide 643428 by 1
We want to figure out the number of times 643428 can be divided by 1.

Moving on to step 1:
6 divided by 1 is 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 6 from 6 leaves us with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 1

Going ahead to step 2:
If we divide 4 by 1, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 64.0
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

Moving on to step 3:
1 can be fit into 3 3 times, resulting in a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 643.0
If we take 3 away from 3, we end up with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 1

Moving on to step 4:
When dividing 4 by 1, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 6434.0
If we take 4 away from 4, we end up with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 1

Step 5:
1 can be fit into 2 2 times, resulting in a remainder of 0.
The next digit of our result is 2. 
Result so far: 64342.0
Subtract 2 from 2 to get 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 1

Advancing to step 6:
The number 1 fits into 8 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 643428.0
Deduct 8 from 8 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 1 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 643428.0
The remainder is 0 after subtracting 0 from 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 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 643428.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 643428.0 with a balance of 0.0.