403943 divided by 13 
We're looking to find how many times 13 goes into 403943.

Going ahead to step 1:
When dividing 4 by 13, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 13

Advancing to step 2:
If we divide 40 by 13, we get 3 and a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 39 from 40 and we're left with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 13

Let's proceed to step 3:
13 goes into 13 1 times with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
The remainder is 0 after subtracting 13 from 13.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 13

Going ahead to step 4:
When dividing 9 by 13, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 310.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (4) from the dividend, attach it to 9 and continue: 94 / 13

Let's proceed to step 5:
If we divide 94 by 13, we get 7 and a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 3107.0
Subtracting 91 from 94 leaves us with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 13

Moving on to step 6:
The number 13 fits into 33 2 times, leaving a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 31072.0
If we take 26 away from 33, we end up 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 7:
70 divided by 13 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 31072.5
If we take 65 away from 70, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
13 can be fit into 50 3 times, resulting in a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 31072.53
If we subtract 39 from 50, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
110 divided by 13 is 8 with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 31072.538
If we take 104 away from 110, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 10:
60 divided by 13 is 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 31072.5384
Subtracting 52 from 60 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
When dividing 80 by 13, we get 6 with a remainder of 2.
The next digit of our result is 6. 
Result so far: 31072.53846
Subtracting 78 from 80 leaves us 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.

Moving on to step 12:
20 divided by 13 is 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 31072.538461
If we take 13 away from 20, we end up 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.

Step 13:
If we divide 70 by 13, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 31072.5384615
The remainder is 5 after subtracting 65 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 14:
The number 13 fits into 50 3 times, leaving a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 31072.53846153
Subtracting 39 from 50 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Our division results in 31072.53846153 with a remaining 1.1e-08.