We're dividing 554198 by 66 
The aim is to understand the frequency of 66 in 554198.

On to step 1:
5 divided by 66 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 66

Going ahead to step 2:
55 divided by 66 is 0 with a remainder of 55.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Fetch the next digit (4) from the dividend, attach it to 55 and continue: 554 / 66

Advancing to step 3:
554 divided by 66 is 8 with a remainder of 26.
The next digit of our result is 8. 
Result so far: 8.0
If we subtract 528 from 554, we get 26.
Fetch the next digit (1) from the dividend, attach it to 26 and continue: 261 / 66

Advancing to step 4:
66 goes into 261 3 times with a remainder of 63.
Use 3 as the next digit of our solution. 
Result so far: 83.0
Subtract 198 from 261 to get 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 66

Going ahead to step 5:
66 can be fit into 639 9 times, resulting in a remainder of 45.
Record the quotient 9 as the next digit in the result. 
Result so far: 839.0
Subtract 594 from 639 to get 45.
Grab the next digit (8) from the dividend, add it to 45, then carry on: 458 / 66

Advancing to step 6:
When dividing 458 by 66, we get 6 with a remainder of 62.
Write down 6 as next digit of the result. 
Result so far: 8396.0
Deduct 396 from 458 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 7:
66 goes into 620 9 times with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 8396.9
Deduct 594 from 620 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 8:
The number 66 fits into 260 3 times, leaving a remainder of 62.
Record the quotient 3 as the next digit in the result. 
Result so far: 8396.93
Subtracting 198 from 260 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 9:
The number 66 fits into 620 9 times, leaving a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 8396.939
Deduct 594 from 620 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 10:
66 goes into 260 3 times with a remainder of 62.
Put 3 as the next digit of the answer. 
Result so far: 8396.9393
Subtracting 198 from 260 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 11:
66 goes into 620 9 times with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 8396.93939
If we subtract 594 from 620, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 12:
When dividing 260 by 66, we get 3 with a remainder of 62.
The next digit of our result is 3. 
Result so far: 8396.939393
Subtract 198 from 260 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 13:
66 goes into 620 9 times with a remainder of 26.
The next digit of our result is 9. 
Result so far: 8396.9393939
The remainder is 26 after subtracting 594 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 14:
If we divide 260 by 66, we get 3 and a remainder of 62.
Put 3 as the next digit of the answer. 
Result so far: 8396.93939393
Deduct 198 from 260 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Our division results in 8396.93939393 with a remaining 6.2e-08.