We look at the division of 66825151 by 354 
The aim is to understand the frequency of 354 in 66825151.

Step 1:
The number 354 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 354

Let's proceed to step 2:
354 goes into 66 0 times with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Include the next digit (8) from the dividend after 66, then repeat: 668 / 354

Step 3:
668 divided by 354 is 1 with a remainder of 314.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 354 from 668, we get 314.
Include the next digit (2) from the dividend after 314, then repeat: 3142 / 354

Let's proceed to step 4:
354 goes into 3142 8 times with a remainder of 310.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Subtracting 2832 from 3142 leaves us with 310.
Take the next digit (5) from the dividend and append it to 310, then repeat: 3105 / 354

Step 5:
When dividing 3105 by 354, we get 8 with a remainder of 273.
Write down 8 as next digit of the result. 
Result so far: 188.0
The remainder is 273 after subtracting 2832 from 3105.
Bring next digit (1) of the dividend behind the 273 and repeat the process: 2731 / 354

On to step 6:
354 can be fit into 2731 7 times, resulting in a remainder of 253.
The number 7 becomes the next digit in our result. 
Result so far: 1887.0
Subtract 2478 from 2731 to get 253.
Append the next digit (5) from the dividend to 253 and continue with: 2535 / 354

Going ahead to step 7:
354 can be fit into 2535 7 times, resulting in a remainder of 57.
The next digit of our result is 7. 
Result so far: 18877.0
If we subtract 2478 from 2535, we get 57.
Include the next digit (1) from the dividend after 57, then repeat: 571 / 354

Going ahead to step 8:
The number 354 fits into 571 1 times, leaving a remainder of 217.
The next digit of our result is 1. 
Result so far: 188771.0
Subtracting 354 from 571 leaves us with 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

Step 9:
2170 divided by 354 is 6 with a remainder of 46.
The number 6 becomes the next digit in our result. 
Result so far: 188771.6
Deduct 2124 from 2170 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
460 divided by 354 is 1 with a remainder of 106.
Write down 1 as next digit of the result. 
Result so far: 188771.61
If we subtract 354 from 460, we get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Let's proceed to step 11:
When dividing 1060 by 354, we get 2 with a remainder of 352.
The next digit of our result is 2. 
Result so far: 188771.612
Subtract 708 from 1060 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 12:
354 goes into 3520 9 times with a remainder of 334.
Record the quotient 9 as the next digit in the result. 
Result so far: 188771.6129
Deduct 3186 from 3520 and we're left with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Advancing to step 13:
3340 divided by 354 is 9 with a remainder of 154.
Record the quotient 9 as the next digit in the result. 
Result so far: 188771.61299
The remainder is 154 after subtracting 3186 from 3340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

The final result is 188771.61299 with a remainder of 0.000154.