We're dividing 15131559 by 665 
We want to figure out the number of times 15131559 can be divided by 665.

Going ahead to step 1:
If we divide 1 by 665, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 665

Advancing to step 2:
If we divide 15 by 665, we get 0 and a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 665

Step 3:
665 can be fit into 151 0 times, resulting in a remainder of 151.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 151 and we're left with 151.
Grab the next digit (3) from the dividend, add it to 151, then carry on: 1513 / 665

Step 4:
If we divide 1513 by 665, we get 2 and a remainder of 183.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1330 from 1513, we get 183.
Bring next digit (1) of the dividend behind the 183 and repeat the process: 1831 / 665

Moving on to step 5:
When dividing 1831 by 665, we get 2 with a remainder of 501.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
Deduct 1330 from 1831 and we're left with 501.
Append the next digit (5) from the dividend to 501 and continue with: 5015 / 665

Moving on to step 6:
If we divide 5015 by 665, we get 7 and a remainder of 360.
Put 7 as the next digit of the answer. 
Result so far: 227.0
Subtract 4655 from 5015 to get 360.
Append the next digit (5) from the dividend to 360 and continue with: 3605 / 665

Moving on to step 7:
The number 665 fits into 3605 5 times, leaving a remainder of 280.
The next digit of our result is 5. 
Result so far: 2275.0
Deduct 3325 from 3605 and we're left with 280.
Bring next digit (9) of the dividend behind the 280 and repeat the process: 2809 / 665

Advancing to step 8:
If we divide 2809 by 665, we get 4 and a remainder of 149.
Use 4 as the next digit of our solution. 
Result so far: 22754.0
Deduct 2660 from 2809 and we're left with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Step 9:
The number 665 fits into 1490 2 times, leaving a remainder of 160.
Record the quotient 2 as the next digit in the result. 
Result so far: 22754.2
Subtracting 1330 from 1490 leaves us with 160.
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 10:
665 can be fit into 1600 2 times, resulting in a remainder of 270.
Use 2 as the next digit of our solution. 
Result so far: 22754.22
The remainder is 270 after subtracting 1330 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

After the division, we end up with 22754.22 and a remainder of 0.27.