13407 ÷ 39 
We want to figure out the number of times 13407 can be divided by 39.

On to step 1:
1 divided by 39 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 39

Going ahead to step 2:
39 can be fit into 13 0 times, resulting in a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Bring next digit (4) of the dividend behind the 13 and repeat the process: 134 / 39

Moving on to step 3:
If we divide 134 by 39, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 117 from 134, we get 17.
Fetch the next digit (0) from the dividend, attach it to 17 and continue: 170 / 39

Let's proceed to step 4:
If we divide 170 by 39, we get 4 and a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 34.0
Subtracting 156 from 170 leaves us with 14.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 39

Step 5:
39 can be fit into 147 3 times, resulting in a remainder of 30.
The next digit of our result is 3. 
Result so far: 343.0
Deduct 117 from 147 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 6:
300 divided by 39 is 7 with a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 343.7
Subtract 273 from 300 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 7:
The number 39 fits into 270 6 times, leaving a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 343.76
If we subtract 234 from 270, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 8:
39 goes into 360 9 times with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 343.769
If we subtract 351 from 360, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
The number 39 fits into 90 2 times, leaving a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 343.7692
If we subtract 78 from 90, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
39 can be fit into 120 3 times, resulting in a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 343.76923
If we take 117 away from 120, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
If we divide 30 by 39, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 343.76923
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 12:
The number 39 fits into 300 7 times, leaving a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 343.7692307
The remainder is 27 after subtracting 273 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 13:
39 can be fit into 270 6 times, resulting in a remainder of 36.
The next digit of our result is 6. 
Result so far: 343.76923076
Subtracting 234 from 270 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

After the division, we end up with 343.76923076 and a remainder of 3.6e-08.