We're dividing 551629 by 66 
The aim is to understand the frequency of 66 in 551629.

On to step 1:
66 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 66

Going ahead to step 2:
55 divided by 66 is 0 with a remainder of 55.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 55, we get 55.
Take the next digit (1) from the dividend and append it to 55, then repeat: 551 / 66

Going ahead to step 3:
When dividing 551 by 66, we get 8 with a remainder of 23.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 528 from 551 to get 23.
Append the next digit (6) from the dividend to 23 and continue with: 236 / 66

Moving on to step 4:
66 can be fit into 236 3 times, resulting in a remainder of 38.
Use 3 as the next digit of our solution. 
Result so far: 83.0
If we take 198 away from 236, we end up with 38.
Append the next digit (2) from the dividend to 38 and continue with: 382 / 66

Advancing to step 5:
When dividing 382 by 66, we get 5 with a remainder of 52.
Write down 5 as next digit of the result. 
Result so far: 835.0
If we subtract 330 from 382, we get 52.
Append the next digit (9) from the dividend to 52 and continue with: 529 / 66

Let's proceed to step 6:
66 can be fit into 529 8 times, resulting in a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 8358.0
The remainder is 1 after subtracting 528 from 529.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
The number 66 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 8358.0
If we take 0 away from 10, we end up 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 8:
The number 66 fits into 100 1 times, leaving a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 8358.01
Subtract 66 from 100 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 9:
The number 66 fits into 340 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 8358.015
The remainder is 10 after subtracting 330 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
100 divided by 66 is 1 with a remainder of 34.
Write down 1 as next digit of the result. 
Result so far: 8358.0151
Subtract 66 from 100 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 11:
66 goes into 340 5 times with a remainder of 10.
The next digit of our result is 5. 
Result so far: 8358.01515
Subtracting 330 from 340 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.

Moving on to step 12:
66 can be fit into 100 1 times, resulting in a remainder of 34.
The next digit of our result is 1. 
Result so far: 8358.015151
Subtract 66 from 100 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 13:
340 divided by 66 is 5 with a remainder of 10.
The next digit of our result is 5. 
Result so far: 8358.0151515
If we take 330 away from 340, we end up 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.

Let's proceed to step 14:
The number 66 fits into 100 1 times, leaving a remainder of 34.
Write down 1 as next digit of the result. 
Result so far: 8358.01515151
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

In conclusion, the division gives 8358.01515151 with a balance of 3.4e-08.