Let's divide 393945 by 257
We want to divide 393945 by 257.

Going ahead to step 1:
3 divided by 257 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 257

Going ahead to step 2:
39 divided by 257 is 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (3) from the dividend after 39, then repeat: 393 / 257

Step 3:
If we divide 393 by 257, we get 1 and a remainder of 136.
The next digit of our result is 1. 
Result so far: 1.0
If we take 257 away from 393, we end up with 136.
Grab the next digit (9) from the dividend, add it to 136, then carry on: 1369 / 257

Let's proceed to step 4:
1369 divided by 257 is 5 with a remainder of 84.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtract 1285 from 1369 to get 84.
Take the next digit (4) from the dividend and append it to 84, then repeat: 844 / 257

Let's proceed to step 5:
The number 257 fits into 844 3 times, leaving a remainder of 73.
The number 3 becomes the next digit in our result. 
Result so far: 153.0
If we subtract 771 from 844, we get 73.
Grab the next digit (5) from the dividend, add it to 73, then carry on: 735 / 257

On to step 6:
257 can be fit into 735 2 times, resulting in a remainder of 221.
Write down 2 as next digit of the result. 
Result so far: 1532.0
Subtract 514 from 735 to get 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

Moving on to step 7:
257 goes into 2210 8 times with a remainder of 154.
The next digit of our result is 8. 
Result so far: 1532.8
Subtract 2056 from 2210 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Step 8:
The number 257 fits into 1540 5 times, leaving a remainder of 255.
Put 5 as the next digit of the answer. 
Result so far: 1532.85
If we take 1285 away from 1540, we end up with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Moving on to step 9:
The number 257 fits into 2550 9 times, leaving a remainder of 237.
Write down 9 as next digit of the result. 
Result so far: 1532.859
If we subtract 2313 from 2550, we get 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

On to step 10:
When dividing 2370 by 257, we get 9 with a remainder of 57.
The next digit of our result is 9. 
Result so far: 1532.8599
Subtract 2313 from 2370 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

The final result is 1532.8599 with a remainder of 0.00057.