We're dividing 643138 by 4 
Our goal is to divide 643138 by 4.

Moving on to step 1:
If we divide 6 by 4, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 4 from 6 and we're left with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 4

Moving on to step 2:
4 can be fit into 24 6 times, resulting in a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we take 24 away from 24, we end up with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 4

Step 3:
When dividing 3 by 4, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 160.0
If we take 0 away from 3, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 4

On to step 4:
When dividing 31 by 4, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 1607.0
Deduct 28 from 31 and we're left with 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 4

On to step 5:
4 can be fit into 33 8 times, resulting in a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 16078.0
The remainder is 1 after subtracting 32 from 33.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 4

Step 6:
If we divide 18 by 4, we get 4 and a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 160784.0
Deduct 16 from 18 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
4 goes into 20 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 160784.5
If we take 20 away from 20, 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.

On to step 8:
When dividing 0 by 4, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 160784.5
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.

Moving on to step 9:
When dividing 0 by 4, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 160784.5
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.

Our division results in 160784.5 with a remaining 0.0.