43604 divided by 66 
The aim is to understand the frequency of 66 in 43604.

Advancing to step 1:
66 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 66

Let's proceed to step 2:
66 goes into 43 0 times with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Append the next digit (6) from the dividend to 43 and continue with: 436 / 66

Going ahead to step 3:
66 can be fit into 436 6 times, resulting in a remainder of 40.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 396 from 436 and we're left with 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 66

On to step 4:
400 divided by 66 is 6 with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 66.0
The remainder is 4 after subtracting 396 from 400.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 66

Advancing to step 5:
The number 66 fits into 44 0 times, leaving a remainder of 44.
Write down 0 as next digit of the result. 
Result so far: 660.0
Deduct 0 from 44 and we're left 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.

Going ahead to step 6:
66 goes into 440 6 times with a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 660.6
If we take 396 away from 440, we end up 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.

Going ahead to step 7:
66 goes into 440 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 660.66
Deduct 396 from 440 and we're left 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.

The quotient of the division is 660.66, and the remainder is 0.044.