We look at the division of 91505488 by 921 
The aim is to understand the frequency of 921 in 91505488.

Moving on to step 1:
9 divided by 921 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 921

Let's proceed to step 2:
91 divided by 921 is 0 with a remainder of 91.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Bring next digit (5) of the dividend behind the 91 and repeat the process: 915 / 921

Step 3:
915 divided by 921 is 0 with a remainder of 915.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 915, we get 915.
Append the next digit (0) from the dividend to 915 and continue with: 9150 / 921

Moving on to step 4:
921 can be fit into 9150 9 times, resulting in a remainder of 861.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 861 after subtracting 8289 from 9150.
Include the next digit (5) from the dividend after 861, then repeat: 8615 / 921

Advancing to step 5:
8615 divided by 921 is 9 with a remainder of 326.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
Deduct 8289 from 8615 and we're left with 326.
Take the next digit (4) from the dividend and append it to 326, then repeat: 3264 / 921

Let's proceed to step 6:
921 goes into 3264 3 times with a remainder of 501.
The next digit of our result is 3. 
Result so far: 993.0
If we take 2763 away from 3264, we end up with 501.
Include the next digit (8) from the dividend after 501, then repeat: 5018 / 921

On to step 7:
If we divide 5018 by 921, we get 5 and a remainder of 413.
Put 5 as the next digit of the answer. 
Result so far: 9935.0
The remainder is 413 after subtracting 4605 from 5018.
Fetch the next digit (8) from the dividend, attach it to 413 and continue: 4138 / 921

On to step 8:
4138 divided by 921 is 4 with a remainder of 454.
Write down 4 as next digit of the result. 
Result so far: 99354.0
If we subtract 3684 from 4138, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Step 9:
921 can be fit into 4540 4 times, resulting in a remainder of 856.
The next digit of our result is 4. 
Result so far: 99354.4
If we take 3684 away from 4540, we end up with 856.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8560, and continue the process.

Moving on to step 10:
The number 921 fits into 8560 9 times, leaving a remainder of 271.
Use 9 as the next digit of our solution. 
Result so far: 99354.49
If we subtract 8289 from 8560, we get 271.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Advancing to step 11:
921 can be fit into 2710 2 times, resulting in a remainder of 868.
Write down 2 as next digit of the result. 
Result so far: 99354.492
The remainder is 868 after subtracting 1842 from 2710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8680, and continue the process.

Step 12:
If we divide 8680 by 921, we get 9 and a remainder of 391.
The next digit of our result is 9. 
Result so far: 99354.4929
The remainder is 391 after subtracting 8289 from 8680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

On to step 13:
When dividing 3910 by 921, we get 4 with a remainder of 226.
Write down 4 as next digit of the result. 
Result so far: 99354.49294
Subtract 3684 from 3910 to get 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Step 14:
The number 921 fits into 2260 2 times, leaving a remainder of 418.
Use 2 as the next digit of our solution. 
Result so far: 99354.492942
If we subtract 1842 from 2260, we get 418.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4180, and continue the process.

Step 15:
When dividing 4180 by 921, we get 4 with a remainder of 496.
Put 4 as the next digit of the answer. 
Result so far: 99354.4929424
The remainder is 496 after subtracting 3684 from 4180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Advancing to step 16:
The number 921 fits into 4960 5 times, leaving a remainder of 355.
Record the quotient 5 as the next digit in the result. 
Result so far: 99354.49294245
Subtract 4605 from 4960 to get 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Our division results in 99354.49294245 with a remaining 3.55e-07.