We're dividing 52109457 by 660 
Let's see how many times 660 fits into 52109457.

On to step 1:
The number 660 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 660

On to step 2:
The number 660 fits into 52 0 times, leaving a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 52, we get 52.
Take the next digit (1) from the dividend and append it to 52, then repeat: 521 / 660

Advancing to step 3:
521 divided by 660 is 0 with a remainder of 521.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 521, we end up with 521.
Include the next digit (0) from the dividend after 521, then repeat: 5210 / 660

Moving on to step 4:
The number 660 fits into 5210 7 times, leaving a remainder of 590.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 590 after subtracting 4620 from 5210.
Fetch the next digit (9) from the dividend, attach it to 590 and continue: 5909 / 660

Advancing to step 5:
The number 660 fits into 5909 8 times, leaving a remainder of 629.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
Subtracting 5280 from 5909 leaves us with 629.
Append the next digit (4) from the dividend to 629 and continue with: 6294 / 660

Step 6:
660 can be fit into 6294 9 times, resulting in a remainder of 354.
Put 9 as the next digit of the answer. 
Result so far: 789.0
If we subtract 5940 from 6294, we get 354.
Bring next digit (5) of the dividend behind the 354 and repeat the process: 3545 / 660

Advancing to step 7:
The number 660 fits into 3545 5 times, leaving a remainder of 245.
Record the quotient 5 as the next digit in the result. 
Result so far: 7895.0
Deduct 3300 from 3545 and we're left with 245.
Bring next digit (7) of the dividend behind the 245 and repeat the process: 2457 / 660

On to step 8:
660 can be fit into 2457 3 times, resulting in a remainder of 477.
Use 3 as the next digit of our solution. 
Result so far: 78953.0
Subtracting 1980 from 2457 leaves us with 477.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4770, and continue the process.

Step 9:
660 can be fit into 4770 7 times, resulting in a remainder of 150.
Use 7 as the next digit of our solution. 
Result so far: 78953.7
Subtracting 4620 from 4770 leaves us with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 10:
When dividing 1500 by 660, we get 2 with a remainder of 180.
Put 2 as the next digit of the answer. 
Result so far: 78953.72
If we subtract 1320 from 1500, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 11:
1800 divided by 660 is 2 with a remainder of 480.
Put 2 as the next digit of the answer. 
Result so far: 78953.722
Deduct 1320 from 1800 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Our division results in 78953.722 with a remaining 0.048.