We're dividing 21960957 by 66 
The aim is to understand the frequency of 66 in 21960957.

Let's proceed to step 1:
The number 66 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 66

Moving on to step 2:
The number 66 fits into 21 0 times, leaving a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (9) from the dividend, add it to 21, then carry on: 219 / 66

Let's proceed to step 3:
When dividing 219 by 66, we get 3 with a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 198 from 219 and we're left with 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 66

Moving on to step 4:
66 goes into 216 3 times with a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Subtracting 198 from 216 leaves us with 18.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 66

Step 5:
When dividing 180 by 66, we get 2 with a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 332.0
If we subtract 132 from 180, we get 48.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 66

Moving on to step 6:
The number 66 fits into 489 7 times, leaving a remainder of 27.
Write down 7 as next digit of the result. 
Result so far: 3327.0
Subtracting 462 from 489 leaves us with 27.
Include the next digit (5) from the dividend after 27, then repeat: 275 / 66

On to step 7:
66 can be fit into 275 4 times, resulting in a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 33274.0
If we take 264 away from 275, we end up with 11.
Grab the next digit (7) from the dividend, add it to 11, then carry on: 117 / 66

Step 8:
If we divide 117 by 66, we get 1 and a remainder of 51.
Record the quotient 1 as the next digit in the result. 
Result so far: 332741.0
Subtract 66 from 117 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 9:
66 goes into 510 7 times with a remainder of 48.
The number 7 becomes the next digit in our result. 
Result so far: 332741.7
Subtract 462 from 510 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 10:
66 can be fit into 480 7 times, resulting in a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 332741.77
Deduct 462 from 480 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 332741.77 and a remainder of 0.018.