We look at the division of 872920 by 66 
The aim is to understand the frequency of 66 in 872920.

Advancing to step 1:
The number 66 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 66

Going ahead to step 2:
If we divide 87 by 66, we get 1 and a remainder of 21.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 66 from 87 leaves us with 21.
Bring next digit (2) of the dividend behind the 21 and repeat the process: 212 / 66

Let's proceed to step 3:
66 goes into 212 3 times with a remainder of 14.
The next digit of our result is 3. 
Result so far: 13.0
Subtract 198 from 212 to get 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 66

Moving on to step 4:
When dividing 149 by 66, we get 2 with a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 132.0
Subtracting 132 from 149 leaves us with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 66

On to step 5:
66 can be fit into 172 2 times, resulting in a remainder of 40.
The next digit of our result is 2. 
Result so far: 1322.0
Deduct 132 from 172 and we're left with 40.
Include the next digit (0) from the dividend after 40, then repeat: 400 / 66

Step 6:
66 goes into 400 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 13226.0
The remainder is 4 after subtracting 396 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
66 can be fit into 40 0 times, resulting in a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 13226.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
The number 66 fits into 400 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 13226.06
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 13226.06
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 10:
The number 66 fits into 400 6 times, leaving a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 13226.0606
Subtract 396 from 400 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 11:
66 can be fit into 40 0 times, resulting in a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 13226.0606
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 12:
66 goes into 400 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 13226.060606
Subtract 396 from 400 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 13:
40 divided by 66 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 13226.060606
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 14:
When dividing 400 by 66, we get 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 13226.06060606
Subtract 396 from 400 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 13226.06060606, and the remainder is 4e-09.