We look at the division of 70204992 by 66 
The aim is to understand the frequency of 66 in 70204992.

On to step 1:
If we divide 7 by 66, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 66

Moving on to step 2:
66 goes into 70 1 times with a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 66 from 70 and we're left with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 66

Going ahead to step 3:
66 goes into 42 0 times with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 42 leaves us with 42.
Take the next digit (0) from the dividend and append it to 42, then repeat: 420 / 66

Moving on to step 4:
When dividing 420 by 66, we get 6 with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 106.0
If we take 396 away from 420, we end up with 24.
Fetch the next digit (4) from the dividend, attach it to 24 and continue: 244 / 66

On to step 5:
66 goes into 244 3 times with a remainder of 46.
The number 3 becomes the next digit in our result. 
Result so far: 1063.0
If we subtract 198 from 244, we get 46.
Append the next digit (9) from the dividend to 46 and continue with: 469 / 66

Advancing to step 6:
66 goes into 469 7 times with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 10637.0
The remainder is 7 after subtracting 462 from 469.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 66

Moving on to step 7:
66 goes into 79 1 times with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 106371.0
The remainder is 13 after subtracting 66 from 79.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 66

Going ahead to step 8:
When dividing 132 by 66, we get 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 1063712.0
Subtracting 132 from 132 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
The number 66 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1063712.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
If we divide 0 by 66, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 1063712.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1063712.0, and the remainder is 0.0.