Let's divide 12151581 by 323
We want to figure out the number of times 12151581 can be divided by 323.

On to step 1:
The number 323 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 323

Step 2:
If we divide 12 by 323, we get 0 and a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 323

On to step 3:
121 divided by 323 is 0 with a remainder of 121.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 121 after subtracting 0 from 121.
Fetch the next digit (5) from the dividend, attach it to 121 and continue: 1215 / 323

Let's proceed to step 4:
1215 divided by 323 is 3 with a remainder of 246.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 969 from 1215 to get 246.
Include the next digit (1) from the dividend after 246, then repeat: 2461 / 323

On to step 5:
323 goes into 2461 7 times with a remainder of 200.
The next digit of our result is 7. 
Result so far: 37.0
If we take 2261 away from 2461, we end up with 200.
Append the next digit (5) from the dividend to 200 and continue with: 2005 / 323

Advancing to step 6:
323 goes into 2005 6 times with a remainder of 67.
Use 6 as the next digit of our solution. 
Result so far: 376.0
The remainder is 67 after subtracting 1938 from 2005.
Grab the next digit (8) from the dividend, add it to 67, then carry on: 678 / 323

On to step 7:
The number 323 fits into 678 2 times, leaving a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 3762.0
The remainder is 32 after subtracting 646 from 678.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 323

Moving on to step 8:
If we divide 321 by 323, we get 0 and a remainder of 321.
The next digit of our result is 0. 
Result so far: 37620.0
Subtract 0 from 321 to get 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Let's proceed to step 9:
The number 323 fits into 3210 9 times, leaving a remainder of 303.
Record the quotient 9 as the next digit in the result. 
Result so far: 37620.9
If we take 2907 away from 3210, we end up with 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Let's proceed to step 10:
3030 divided by 323 is 9 with a remainder of 123.
The number 9 becomes the next digit in our result. 
Result so far: 37620.99
Subtract 2907 from 3030 to get 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

The final result is 37620.99 with a remainder of 0.123.