We look at the division of 81515866 by 604 
Our goal is to divide 81515866 by 604.

Step 1:
The number 604 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 604

Going ahead to step 2:
If we divide 81 by 604, we get 0 and a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Append the next digit (5) from the dividend to 81 and continue with: 815 / 604

Step 3:
604 can be fit into 815 1 times, resulting in a remainder of 211.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 604 from 815 leaves us with 211.
Grab the next digit (1) from the dividend, add it to 211, then carry on: 2111 / 604

On to step 4:
The number 604 fits into 2111 3 times, leaving a remainder of 299.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Deduct 1812 from 2111 and we're left with 299.
Fetch the next digit (5) from the dividend, attach it to 299 and continue: 2995 / 604

Going ahead to step 5:
When dividing 2995 by 604, we get 4 with a remainder of 579.
Record the quotient 4 as the next digit in the result. 
Result so far: 134.0
Deduct 2416 from 2995 and we're left with 579.
Grab the next digit (8) from the dividend, add it to 579, then carry on: 5798 / 604

Let's proceed to step 6:
If we divide 5798 by 604, we get 9 and a remainder of 362.
Record the quotient 9 as the next digit in the result. 
Result so far: 1349.0
If we take 5436 away from 5798, we end up with 362.
Take the next digit (6) from the dividend and append it to 362, then repeat: 3626 / 604

On to step 7:
604 goes into 3626 6 times with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 13496.0
Subtract 3624 from 3626 to get 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 604

Step 8:
The number 604 fits into 26 0 times, leaving a remainder of 26.
Use 0 as the next digit of our solution. 
Result so far: 134960.0
The remainder is 26 after subtracting 0 from 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 9:
604 goes into 260 0 times with a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 134960.0
The remainder is 260 after subtracting 0 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Going ahead to step 10:
604 goes into 2600 4 times with a remainder of 184.
The next digit of our result is 4. 
Result so far: 134960.04
Subtract 2416 from 2600 to get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Going ahead to step 11:
If we divide 1840 by 604, we get 3 and a remainder of 28.
The number 3 becomes the next digit in our result. 
Result so far: 134960.043
Deduct 1812 from 1840 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 12:
604 goes into 280 0 times with a remainder of 280.
Put 0 as the next digit of the answer. 
Result so far: 134960.043
Subtract 0 from 280 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 13:
When dividing 2800 by 604, we get 4 with a remainder of 384.
Put 4 as the next digit of the answer. 
Result so far: 134960.04304
If we subtract 2416 from 2800, we get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Going ahead to step 14:
604 goes into 3840 6 times with a remainder of 216.
Write down 6 as next digit of the result. 
Result so far: 134960.043046
The remainder is 216 after subtracting 3624 from 3840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Advancing to step 15:
If we divide 2160 by 604, we get 3 and a remainder of 348.
Use 3 as the next digit of our solution. 
Result so far: 134960.0430463
Subtract 1812 from 2160 to get 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Moving on to step 16:
The number 604 fits into 3480 5 times, leaving a remainder of 460.
Record the quotient 5 as the next digit in the result. 
Result so far: 134960.04304635
If we take 3020 away from 3480, we end up with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Our division results in 134960.04304635 with a remaining 4.6e-07.