We're dividing 21660755 by 891 
The aim is to understand the frequency of 891 in 21660755.

Let's proceed to step 1:
891 goes into 2 0 times with 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.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 891

Moving on to step 2:
If we divide 21 by 891, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 891

Advancing to step 3:
891 goes into 216 0 times with a remainder of 216.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 216 leaves us with 216.
Append the next digit (6) from the dividend to 216 and continue with: 2166 / 891

Moving on to step 4:
When dividing 2166 by 891, we get 2 with a remainder of 384.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 1782 from 2166, we get 384.
Grab the next digit (0) from the dividend, add it to 384, then carry on: 3840 / 891

Advancing to step 5:
891 goes into 3840 4 times with a remainder of 276.
Write down 4 as next digit of the result. 
Result so far: 24.0
Subtract 3564 from 3840 to get 276.
Include the next digit (7) from the dividend after 276, then repeat: 2767 / 891

Let's proceed to step 6:
2767 divided by 891 is 3 with a remainder of 94.
Record the quotient 3 as the next digit in the result. 
Result so far: 243.0
The remainder is 94 after subtracting 2673 from 2767.
Bring next digit (5) of the dividend behind the 94 and repeat the process: 945 / 891

On to step 7:
If we divide 945 by 891, we get 1 and a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 2431.0
If we take 891 away from 945, we end up with 54.
Grab the next digit (5) from the dividend, add it to 54, then carry on: 545 / 891

On to step 8:
545 divided by 891 is 0 with a remainder of 545.
The number 0 becomes the next digit in our result. 
Result so far: 24310.0
Deduct 0 from 545 and we're left with 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Let's proceed to step 9:
If we divide 5450 by 891, we get 6 and a remainder of 104.
Use 6 as the next digit of our solution. 
Result so far: 24310.6
The remainder is 104 after subtracting 5346 from 5450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Advancing to step 10:
The number 891 fits into 1040 1 times, leaving a remainder of 149.
Put 1 as the next digit of the answer. 
Result so far: 24310.61
If we subtract 891 from 1040, we get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Step 11:
1490 divided by 891 is 1 with a remainder of 599.
Use 1 as the next digit of our solution. 
Result so far: 24310.611
If we subtract 891 from 1490, we get 599.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5990, and continue the process.

The final result is 24310.611 with a remainder of 0.0599.