15556045 ÷ 660 
We want to figure out the number of times 15556045 can be divided by 660.

On to step 1:
If we divide 1 by 660, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 660

On to step 2:
If we divide 15 by 660, we get 0 and a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Take the next digit (5) from the dividend and append it to 15, then repeat: 155 / 660

Step 3:
155 divided by 660 is 0 with a remainder of 155.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 155 after subtracting 0 from 155.
Take the next digit (5) from the dividend and append it to 155, then repeat: 1555 / 660

Step 4:
If we divide 1555 by 660, we get 2 and a remainder of 235.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 235 after subtracting 1320 from 1555.
Take the next digit (6) from the dividend and append it to 235, then repeat: 2356 / 660

On to step 5:
2356 divided by 660 is 3 with a remainder of 376.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
If we take 1980 away from 2356, we end up with 376.
Take the next digit (0) from the dividend and append it to 376, then repeat: 3760 / 660

Step 6:
660 goes into 3760 5 times with a remainder of 460.
Use 5 as the next digit of our solution. 
Result so far: 235.0
Deduct 3300 from 3760 and we're left with 460.
Include the next digit (4) from the dividend after 460, then repeat: 4604 / 660

Going ahead to step 7:
The number 660 fits into 4604 6 times, leaving a remainder of 644.
Use 6 as the next digit of our solution. 
Result so far: 2356.0
If we take 3960 away from 4604, we end up with 644.
Fetch the next digit (5) from the dividend, attach it to 644 and continue: 6445 / 660

On to step 8:
660 can be fit into 6445 9 times, resulting in a remainder of 505.
Put 9 as the next digit of the answer. 
Result so far: 23569.0
Subtract 5940 from 6445 to get 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

On to step 9:
The number 660 fits into 5050 7 times, leaving a remainder of 430.
Write down 7 as next digit of the result. 
Result so far: 23569.7
Subtract 4620 from 5050 to get 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Moving on to step 10:
660 goes into 4300 6 times with a remainder of 340.
Use 6 as the next digit of our solution. 
Result so far: 23569.76
If we take 3960 away from 4300, we end up 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.

On to step 11:
660 goes into 3400 5 times with a remainder of 100.
The next digit of our result is 5. 
Result so far: 23569.765
Deduct 3300 from 3400 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 12:
1000 divided by 660 is 1 with a remainder of 340.
Record the quotient 1 as the next digit in the result. 
Result so far: 23569.7651
Subtract 660 from 1000 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 13:
When dividing 3400 by 660, we get 5 with a remainder of 100.
The next digit of our result is 5. 
Result so far: 23569.76515
Subtracting 3300 from 3400 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 14:
When dividing 1000 by 660, we get 1 with a remainder of 340.
Record the quotient 1 as the next digit in the result. 
Result so far: 23569.765151
If we subtract 660 from 1000, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Step 15:
When dividing 3400 by 660, we get 5 with a remainder of 100.
Write down 5 as next digit of the result. 
Result so far: 23569.7651515
The remainder is 100 after subtracting 3300 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 16:
The number 660 fits into 1000 1 times, leaving a remainder of 340.
Write down 1 as next digit of the result. 
Result so far: 23569.76515151
If we subtract 660 from 1000, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

After the division, we end up with 23569.76515151 and a remainder of 3.4e-07.