We're dividing 352558 by 66 
The aim is to understand the frequency of 66 in 352558.

Going ahead to step 1:
If we divide 3 by 66, we get 0 and 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.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 66

On to step 2:
66 goes into 35 0 times with a remainder of 35.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Append the next digit (2) from the dividend to 35 and continue with: 352 / 66

On to step 3:
352 divided by 66 is 5 with a remainder of 22.
The next digit of our result is 5. 
Result so far: 5.0
If we take 330 away from 352, we end up with 22.
Grab the next digit (5) from the dividend, add it to 22, then carry on: 225 / 66

Moving on to step 4:
66 can be fit into 225 3 times, resulting in a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
If we subtract 198 from 225, we get 27.
Include the next digit (5) from the dividend after 27, then repeat: 275 / 66

Let's proceed to step 5:
When dividing 275 by 66, we get 4 with a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 534.0
If we take 264 away from 275, we end up with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 66

Going ahead to step 6:
If we divide 118 by 66, we get 1 and a remainder of 52.
Put 1 as the next digit of the answer. 
Result so far: 5341.0
Deduct 66 from 118 and we're left 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.

Going ahead to step 7:
66 can be fit into 520 7 times, resulting in a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 5341.7
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.

Moving on to step 8:
66 can be fit into 580 8 times, resulting in a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 5341.78
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.

Advancing to step 9:
66 can be fit into 520 7 times, resulting in a remainder of 58.
Use 7 as the next digit of our solution. 
Result so far: 5341.787
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.

On to step 10:
580 divided by 66 is 8 with a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 5341.7878
Deduct 528 from 580 and we're left 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.

On to step 11:
The number 66 fits into 520 7 times, leaving a remainder of 58.
The next digit of our result is 7. 
Result so far: 5341.78787
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 12:
580 divided by 66 is 8 with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 5341.787878
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.

Step 13:
The number 66 fits into 520 7 times, leaving a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 5341.7878787
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.

Going ahead to step 14:
66 goes into 580 8 times with a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 5341.78787878
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.

Our division results in 5341.78787878 with a remaining 5.2e-08.