We divide 1643904 by 253
We're looking to find how many times 253 goes into 1643904.

Advancing to step 1:
When dividing 1 by 253, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 253

Moving on to step 2:
253 can be fit into 16 0 times, resulting in a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Take the next digit (4) from the dividend and append it to 16, then repeat: 164 / 253

Let's proceed to step 3:
When dividing 164 by 253, we get 0 with a remainder of 164.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 164, we get 164.
Append the next digit (3) from the dividend to 164 and continue with: 1643 / 253

Moving on to step 4:
If we divide 1643 by 253, we get 6 and a remainder of 125.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 1518 from 1643, we get 125.
Take the next digit (9) from the dividend and append it to 125, then repeat: 1259 / 253

Advancing to step 5:
253 can be fit into 1259 4 times, resulting in a remainder of 247.
Put 4 as the next digit of the answer. 
Result so far: 64.0
Subtracting 1012 from 1259 leaves us with 247.
Take the next digit (0) from the dividend and append it to 247, then repeat: 2470 / 253

Let's proceed to step 6:
The number 253 fits into 2470 9 times, leaving a remainder of 193.
Record the quotient 9 as the next digit in the result. 
Result so far: 649.0
Subtract 2277 from 2470 to get 193.
Append the next digit (4) from the dividend to 193 and continue with: 1934 / 253

Let's proceed to step 7:
The number 253 fits into 1934 7 times, leaving a remainder of 163.
The next digit of our result is 7. 
Result so far: 6497.0
If we take 1771 away from 1934, we end up with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

On to step 8:
When dividing 1630 by 253, we get 6 with a remainder of 112.
Write down 6 as next digit of the result. 
Result so far: 6497.6
If we subtract 1518 from 1630, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 9:
The number 253 fits into 1120 4 times, leaving a remainder of 108.
Write down 4 as next digit of the result. 
Result so far: 6497.64
Deduct 1012 from 1120 and we're left with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 10:
253 can be fit into 1080 4 times, resulting in a remainder of 68.
Write down 4 as next digit of the result. 
Result so far: 6497.644
Deduct 1012 from 1080 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

The final outcome is 6497.644, with a leftover of 0.0068.