643900 divided by 33 
Our goal is to divide 643900 by 33.

Advancing to step 1:
When dividing 6 by 33, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 33

Advancing to step 2:
The number 33 fits into 64 1 times, leaving a remainder of 31.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 33 from 64 leaves us with 31.
Take the next digit (3) from the dividend and append it to 31, then repeat: 313 / 33

Moving on to step 3:
33 goes into 313 9 times with a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
The remainder is 16 after subtracting 297 from 313.
Fetch the next digit (9) from the dividend, attach it to 16 and continue: 169 / 33

Advancing to step 4:
If we divide 169 by 33, we get 5 and a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 195.0
If we take 165 away from 169, we end up with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 33

Going ahead to step 5:
33 goes into 40 1 times with a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 1951.0
Subtracting 33 from 40 leaves us with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 33

Step 6:
33 goes into 70 2 times with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 19512.0
If we take 66 away from 70, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
When dividing 40 by 33, we get 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 19512.1
Subtracting 33 from 40 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
33 goes into 70 2 times with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 19512.12
The remainder is 4 after subtracting 66 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
The number 33 fits into 40 1 times, leaving a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 19512.121
If we subtract 33 from 40, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 10:
The number 33 fits into 70 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 19512.1212
If we take 66 away from 70, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 11:
When dividing 40 by 33, we get 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 19512.12121
Subtracting 33 from 40 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 12:
If we divide 70 by 33, we get 2 and a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 19512.121212
Deduct 66 from 70 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 13:
When dividing 40 by 33, we get 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 19512.1212121
Subtracting 33 from 40 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 14:
When dividing 70 by 33, we get 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 19512.12121212
Subtracting 66 from 70 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 19512.12121212 with a remaining 4e-09.