We're dividing 488221 by 66 
The aim is to understand the frequency of 66 in 488221.

On to step 1:
4 divided by 66 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 66

Let's proceed to step 2:
When dividing 48 by 66, we get 0 with a remainder of 48.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 48 leaves us with 48.
Grab the next digit (8) from the dividend, add it to 48, then carry on: 488 / 66

Let's proceed to step 3:
If we divide 488 by 66, we get 7 and a remainder of 26.
The next digit of our result is 7. 
Result so far: 7.0
Subtracting 462 from 488 leaves us with 26.
Grab the next digit (2) from the dividend, add it to 26, then carry on: 262 / 66

Let's proceed to step 4:
66 goes into 262 3 times with a remainder of 64.
Record the quotient 3 as the next digit in the result. 
Result so far: 73.0
Deduct 198 from 262 and we're left with 64.
Grab the next digit (2) from the dividend, add it to 64, then carry on: 642 / 66

Advancing to step 5:
The number 66 fits into 642 9 times, leaving a remainder of 48.
The next digit of our result is 9. 
Result so far: 739.0
If we take 594 away from 642, we end up with 48.
Fetch the next digit (1) from the dividend, attach it to 48 and continue: 481 / 66

Advancing to step 6:
When dividing 481 by 66, we get 7 with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 7397.0
The remainder is 19 after subtracting 462 from 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 7:
66 goes into 190 2 times with a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 7397.2
Subtracting 132 from 190 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
When dividing 580 by 66, we get 8 with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 7397.28
Subtracting 528 from 580 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 9:
66 goes into 520 7 times with a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 7397.287
Subtract 462 from 520 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 10:
If we divide 580 by 66, we get 8 and a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 7397.2878
Subtract 528 from 580 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 11:
66 goes into 520 7 times with a remainder of 58.
Use 7 as the next digit of our solution. 
Result so far: 7397.28787
Deduct 462 from 520 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 12:
If we divide 580 by 66, we get 8 and a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 7397.287878
If we subtract 528 from 580, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 13:
66 goes into 520 7 times with a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 7397.2878787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 14:
The number 66 fits into 580 8 times, leaving a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 7397.28787878
If we take 528 away from 580, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

The final result is 7397.28787878 with a remainder of 5.2e-08.