We look at the division of 355925 by 66 
The aim is to understand the frequency of 66 in 355925.

Step 1:
3 divided by 66 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 66

Let's proceed to step 2:
The number 66 fits into 35 0 times, leaving a remainder of 35.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Take the next digit (5) from the dividend and append it to 35, then repeat: 355 / 66

Advancing to step 3:
If we divide 355 by 66, we get 5 and a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 330 from 355 and we're left with 25.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 66

Going ahead to step 4:
If we divide 259 by 66, we get 3 and a remainder of 61.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
Deduct 198 from 259 and we're left with 61.
Bring next digit (2) of the dividend behind the 61 and repeat the process: 612 / 66

Advancing to step 5:
If we divide 612 by 66, we get 9 and a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 539.0
Subtract 594 from 612 to get 18.
Fetch the next digit (5) from the dividend, attach it to 18 and continue: 185 / 66

Going ahead to step 6:
If we divide 185 by 66, we get 2 and a remainder of 53.
The next digit of our result is 2. 
Result so far: 5392.0
Subtracting 132 from 185 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 7:
The number 66 fits into 530 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 5392.8
Subtracting 528 from 530 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
66 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 5392.8
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
When dividing 200 by 66, we get 3 with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 5392.803
Subtracting 198 from 200 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
66 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 5392.803
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
When dividing 200 by 66, we get 3 with a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 5392.80303
Deduct 198 from 200 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 12:
66 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 5392.80303
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
66 can be fit into 200 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 5392.8030303
Subtracting 198 from 200 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 14:
66 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 5392.8030303
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 5392.8030303 with a remaining 2e-08.