We're dividing 66050830 by 660 
The aim is to understand the frequency of 660 in 66050830.

On to step 1:
660 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 660

Moving on to step 2:
66 divided by 660 is 0 with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Bring next digit (0) of the dividend behind the 66 and repeat the process: 660 / 660

Advancing to step 3:
When dividing 660 by 660, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 660 away from 660, we end up with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 660

Going ahead to step 4:
If we divide 5 by 660, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtract 0 from 5 to get 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 660

On to step 5:
660 can be fit into 50 0 times, resulting in a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 100.0
Subtract 0 from 50 to get 50.
Fetch the next digit (8) from the dividend, attach it to 50 and continue: 508 / 660

Moving on to step 6:
When dividing 508 by 660, we get 0 with a remainder of 508.
The next digit of our result is 0. 
Result so far: 1000.0
Subtract 0 from 508 to get 508.
Include the next digit (3) from the dividend after 508, then repeat: 5083 / 660

On to step 7:
660 goes into 5083 7 times with a remainder of 463.
Put 7 as the next digit of the answer. 
Result so far: 10007.0
Subtracting 4620 from 5083 leaves us with 463.
Fetch the next digit (0) from the dividend, attach it to 463 and continue: 4630 / 660

Going ahead to step 8:
660 can be fit into 4630 7 times, resulting in a remainder of 10.
The next digit of our result is 7. 
Result so far: 100077.0
Subtracting 4620 from 4630 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
The number 660 fits into 100 0 times, leaving a remainder of 100.
The number 0 becomes the next digit in our result. 
Result so far: 100077.0
If we take 0 away from 100, we end up 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 10:
When dividing 1000 by 660, we get 1 with a remainder of 340.
Put 1 as the next digit of the answer. 
Result so far: 100077.01
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.

Moving on to step 11:
If we divide 3400 by 660, we get 5 and a remainder of 100.
The next digit of our result is 5. 
Result so far: 100077.015
Subtract 3300 from 3400 to get 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:
If we divide 1000 by 660, we get 1 and a remainder of 340.
The next digit of our result is 1. 
Result so far: 100077.0151
Deduct 660 from 1000 and we're left 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.

Advancing to step 13:
If we divide 3400 by 660, we get 5 and a remainder of 100.
The next digit of our result is 5. 
Result so far: 100077.01515
Subtract 3300 from 3400 to get 100.
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 14:
If we divide 1000 by 660, we get 1 and a remainder of 340.
The next digit of our result is 1. 
Result so far: 100077.015151
If we take 660 away from 1000, 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.

Step 15:
When dividing 3400 by 660, we get 5 with a remainder of 100.
Record the quotient 5 as the next digit in the result. 
Result so far: 100077.0151515
If we subtract 3300 from 3400, we get 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 16:
660 goes into 1000 1 times with a remainder of 340.
Record the quotient 1 as the next digit in the result. 
Result so far: 100077.01515151
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.

The quotient of the division is 100077.01515151, and the remainder is 3.4e-07.