12938185 divided by 408 
We're looking to find how many times 408 goes into 12938185.

On to step 1:
The number 408 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 408

Step 2:
If we divide 12 by 408, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 408

Moving on to step 3:
If we divide 129 by 408, we get 0 and a remainder of 129.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 129 after subtracting 0 from 129.
Include the next digit (3) from the dividend after 129, then repeat: 1293 / 408

Advancing to step 4:
If we divide 1293 by 408, we get 3 and a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 1224 from 1293 leaves us with 69.
Bring next digit (8) of the dividend behind the 69 and repeat the process: 698 / 408

Let's proceed to step 5:
When dividing 698 by 408, we get 1 with a remainder of 290.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
Subtract 408 from 698 to get 290.
Take the next digit (1) from the dividend and append it to 290, then repeat: 2901 / 408

Step 6:
When dividing 2901 by 408, we get 7 with a remainder of 45.
The number 7 becomes the next digit in our result. 
Result so far: 317.0
The remainder is 45 after subtracting 2856 from 2901.
Include the next digit (8) from the dividend after 45, then repeat: 458 / 408

On to step 7:
408 goes into 458 1 times with a remainder of 50.
The next digit of our result is 1. 
Result so far: 3171.0
Deduct 408 from 458 and we're left with 50.
Fetch the next digit (5) from the dividend, attach it to 50 and continue: 505 / 408

Step 8:
505 divided by 408 is 1 with a remainder of 97.
Record the quotient 1 as the next digit in the result. 
Result so far: 31711.0
If we subtract 408 from 505, we get 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Moving on to step 9:
970 divided by 408 is 2 with a remainder of 154.
Use 2 as the next digit of our solution. 
Result so far: 31711.2
If we take 816 away from 970, we end up with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 10:
408 goes into 1540 3 times with a remainder of 316.
Record the quotient 3 as the next digit in the result. 
Result so far: 31711.23
The remainder is 316 after subtracting 1224 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 11:
When dividing 3160 by 408, we get 7 with a remainder of 304.
Record the quotient 7 as the next digit in the result. 
Result so far: 31711.237
If we subtract 2856 from 3160, we get 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

On to step 12:
408 goes into 3040 7 times with a remainder of 184.
Use 7 as the next digit of our solution. 
Result so far: 31711.2377
The remainder is 184 after subtracting 2856 from 3040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

The final outcome is 31711.2377, with a leftover of 0.00184.