51065367 ÷ 660 
The aim is to understand the frequency of 660 in 51065367.

On to step 1:
When dividing 5 by 660, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 660

Going ahead to step 2:
660 goes into 51 0 times with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Include the next digit (0) from the dividend after 51, then repeat: 510 / 660

Advancing to step 3:
If we divide 510 by 660, we get 0 and a remainder of 510.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 510, we end up with 510.
Take the next digit (6) from the dividend and append it to 510, then repeat: 5106 / 660

Advancing to step 4:
When dividing 5106 by 660, we get 7 with a remainder of 486.
Write down 7 as next digit of the result. 
Result so far: 7.0
Deduct 4620 from 5106 and we're left with 486.
Fetch the next digit (5) from the dividend, attach it to 486 and continue: 4865 / 660

Step 5:
660 can be fit into 4865 7 times, resulting in a remainder of 245.
The number 7 becomes the next digit in our result. 
Result so far: 77.0
Subtracting 4620 from 4865 leaves us with 245.
Fetch the next digit (3) from the dividend, attach it to 245 and continue: 2453 / 660

Going ahead to step 6:
If we divide 2453 by 660, we get 3 and a remainder of 473.
Record the quotient 3 as the next digit in the result. 
Result so far: 773.0
The remainder is 473 after subtracting 1980 from 2453.
Take the next digit (6) from the dividend and append it to 473, then repeat: 4736 / 660

Advancing to step 7:
660 can be fit into 4736 7 times, resulting in a remainder of 116.
Use 7 as the next digit of our solution. 
Result so far: 7737.0
The remainder is 116 after subtracting 4620 from 4736.
Include the next digit (7) from the dividend after 116, then repeat: 1167 / 660

Going ahead to step 8:
660 can be fit into 1167 1 times, resulting in a remainder of 507.
Record the quotient 1 as the next digit in the result. 
Result so far: 77371.0
If we subtract 660 from 1167, we get 507.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5070, and continue the process.

On to step 9:
The number 660 fits into 5070 7 times, leaving a remainder of 450.
The next digit of our result is 7. 
Result so far: 77371.7
Subtract 4620 from 5070 to get 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

On to step 10:
660 can be fit into 4500 6 times, resulting in a remainder of 540.
Use 6 as the next digit of our solution. 
Result so far: 77371.76
If we take 3960 away from 4500, we end up with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

On to step 11:
The number 660 fits into 5400 8 times, leaving a remainder of 120.
Record the quotient 8 as the next digit in the result. 
Result so far: 77371.768
Subtract 5280 from 5400 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 12:
If we divide 1200 by 660, we get 1 and a remainder of 540.
Put 1 as the next digit of the answer. 
Result so far: 77371.7681
Deduct 660 from 1200 and we're left with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

On to step 13:
If we divide 5400 by 660, we get 8 and a remainder of 120.
The number 8 becomes the next digit in our result. 
Result so far: 77371.76818
Subtracting 5280 from 5400 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 14:
660 goes into 1200 1 times with a remainder of 540.
Record the quotient 1 as the next digit in the result. 
Result so far: 77371.768181
Subtract 660 from 1200 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

On to step 15:
If we divide 5400 by 660, we get 8 and a remainder of 120.
Write down 8 as next digit of the result. 
Result so far: 77371.7681818
Deduct 5280 from 5400 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 16:
660 goes into 1200 1 times with a remainder of 540.
Put 1 as the next digit of the answer. 
Result so far: 77371.76818181
Subtract 660 from 1200 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

The quotient of the division is 77371.76818181, and the remainder is 5.4e-07.