Let's divide 15686115 by 646
Our goal is to divide 15686115 by 646.

On to step 1:
When dividing 1 by 646, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 646

On to step 2:
When dividing 15 by 646, we get 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 646

Step 3:
The number 646 fits into 156 0 times, leaving a remainder of 156.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 156, we get 156.
Append the next digit (8) from the dividend to 156 and continue with: 1568 / 646

Let's proceed to step 4:
The number 646 fits into 1568 2 times, leaving a remainder of 276.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1292 from 1568 leaves us with 276.
Include the next digit (6) from the dividend after 276, then repeat: 2766 / 646

Step 5:
The number 646 fits into 2766 4 times, leaving a remainder of 182.
The next digit of our result is 4. 
Result so far: 24.0
Subtract 2584 from 2766 to get 182.
Include the next digit (1) from the dividend after 182, then repeat: 1821 / 646

Advancing to step 6:
The number 646 fits into 1821 2 times, leaving a remainder of 529.
The next digit of our result is 2. 
Result so far: 242.0
Subtract 1292 from 1821 to get 529.
Include the next digit (1) from the dividend after 529, then repeat: 5291 / 646

On to step 7:
5291 divided by 646 is 8 with a remainder of 123.
Record the quotient 8 as the next digit in the result. 
Result so far: 2428.0
Deduct 5168 from 5291 and we're left with 123.
Bring next digit (5) of the dividend behind the 123 and repeat the process: 1235 / 646

Let's proceed to step 8:
The number 646 fits into 1235 1 times, leaving a remainder of 589.
Record the quotient 1 as the next digit in the result. 
Result so far: 24281.0
If we subtract 646 from 1235, we get 589.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5890, and continue the process.

Going ahead to step 9:
646 can be fit into 5890 9 times, resulting in a remainder of 76.
Record the quotient 9 as the next digit in the result. 
Result so far: 24281.9
Deduct 5814 from 5890 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 10:
If we divide 760 by 646, we get 1 and a remainder of 114.
Record the quotient 1 as the next digit in the result. 
Result so far: 24281.91
If we subtract 646 from 760, we get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Going ahead to step 11:
When dividing 1140 by 646, we get 1 with a remainder of 494.
Write down 1 as next digit of the result. 
Result so far: 24281.911
Subtract 646 from 1140 to get 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

After the division, we end up with 24281.911 and a remainder of 0.0494.