We look at the division of 3131404 by 810 
We want to figure out the number of times 3131404 can be divided by 810.

Going ahead to step 1:
3 divided by 810 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 810

Step 2:
810 goes into 31 0 times with a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Bring next digit (3) of the dividend behind the 31 and repeat the process: 313 / 810

On to step 3:
If we divide 313 by 810, we get 0 and a remainder of 313.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 313 leaves us with 313.
Fetch the next digit (1) from the dividend, attach it to 313 and continue: 3131 / 810

Moving on to step 4:
3131 divided by 810 is 3 with a remainder of 701.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 2430 away from 3131, we end up with 701.
Bring next digit (4) of the dividend behind the 701 and repeat the process: 7014 / 810

Going ahead to step 5:
810 can be fit into 7014 8 times, resulting in a remainder of 534.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Subtracting 6480 from 7014 leaves us with 534.
Take the next digit (0) from the dividend and append it to 534, then repeat: 5340 / 810

On to step 6:
810 goes into 5340 6 times with a remainder of 480.
Record the quotient 6 as the next digit in the result. 
Result so far: 386.0
Subtract 4860 from 5340 to get 480.
Fetch the next digit (4) from the dividend, attach it to 480 and continue: 4804 / 810

Step 7:
810 goes into 4804 5 times with a remainder of 754.
Put 5 as the next digit of the answer. 
Result so far: 3865.0
The remainder is 754 after subtracting 4050 from 4804.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7540, and continue the process.

On to step 8:
The number 810 fits into 7540 9 times, leaving a remainder of 250.
The number 9 becomes the next digit in our result. 
Result so far: 3865.9
If we subtract 7290 from 7540, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 9:
810 goes into 2500 3 times with a remainder of 70.
Write down 3 as next digit of the result. 
Result so far: 3865.93
If we subtract 2430 from 2500, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 10:
700 divided by 810 is 0 with a remainder of 700.
The next digit of our result is 0. 
Result so far: 3865.93
Deduct 0 from 700 and we're left with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Going ahead to step 11:
The number 810 fits into 7000 8 times, leaving a remainder of 520.
Write down 8 as next digit of the result. 
Result so far: 3865.9308
Subtracting 6480 from 7000 leaves us with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Going ahead to step 12:
810 can be fit into 5200 6 times, resulting in a remainder of 340.
The number 6 becomes the next digit in our result. 
Result so far: 3865.93086
Deduct 4860 from 5200 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 13:
810 goes into 3400 4 times with a remainder of 160.
Put 4 as the next digit of the answer. 
Result so far: 3865.930864
The remainder is 160 after subtracting 3240 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 14:
810 can be fit into 1600 1 times, resulting in a remainder of 790.
Put 1 as the next digit of the answer. 
Result so far: 3865.9308641
If we take 810 away from 1600, we end up with 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7900, and continue the process.

Let's proceed to step 15:
The number 810 fits into 7900 9 times, leaving a remainder of 610.
Record the quotient 9 as the next digit in the result. 
Result so far: 3865.93086419
Subtract 7290 from 7900 to get 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

After the division, we end up with 3865.93086419 and a remainder of 6.1e-07.