We're dividing 45571130 by 66 
The aim is to understand the frequency of 66 in 45571130.

On to step 1:
66 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 66

Step 2:
The number 66 fits into 45 0 times, leaving a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Include the next digit (5) from the dividend after 45, then repeat: 455 / 66

Advancing to step 3:
If we divide 455 by 66, we get 6 and a remainder of 59.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we take 396 away from 455, we end up with 59.
Bring next digit (7) of the dividend behind the 59 and repeat the process: 597 / 66

Moving on to step 4:
597 divided by 66 is 9 with a remainder of 3.
The next digit of our result is 9. 
Result so far: 69.0
Subtract 594 from 597 to get 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 66

Advancing to step 5:
If we divide 31 by 66, we get 0 and a remainder of 31.
The next digit of our result is 0. 
Result so far: 690.0
If we take 0 away from 31, we end up with 31.
Bring next digit (1) of the dividend behind the 31 and repeat the process: 311 / 66

Step 6:
The number 66 fits into 311 4 times, leaving a remainder of 47.
Write down 4 as next digit of the result. 
Result so far: 6904.0
If we take 264 away from 311, we end up with 47.
Take the next digit (3) from the dividend and append it to 47, then repeat: 473 / 66

Moving on to step 7:
66 goes into 473 7 times with a remainder of 11.
The number 7 becomes the next digit in our result. 
Result so far: 69047.0
The remainder is 11 after subtracting 462 from 473.
Bring next digit (0) of the dividend behind the 11 and repeat the process: 110 / 66

Going ahead to step 8:
The number 66 fits into 110 1 times, leaving a remainder of 44.
Use 1 as the next digit of our solution. 
Result so far: 690471.0
Subtracting 66 from 110 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 9:
The number 66 fits into 440 6 times, leaving a remainder of 44.
The next digit of our result is 6. 
Result so far: 690471.6
Subtract 396 from 440 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 10:
66 goes into 440 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 690471.66
Subtracting 396 from 440 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Our division results in 690471.66 with a remaining 0.044.