Let's divide 55857321 by 921
The aim is to understand the frequency of 921 in 55857321.

Step 1:
The number 921 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 921

On to step 2:
When dividing 55 by 921, we get 0 with a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 55, we get 55.
Take the next digit (8) from the dividend and append it to 55, then repeat: 558 / 921

On to step 3:
If we divide 558 by 921, we get 0 and a remainder of 558.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 558 leaves us with 558.
Bring next digit (5) of the dividend behind the 558 and repeat the process: 5585 / 921

Let's proceed to step 4:
921 can be fit into 5585 6 times, resulting in a remainder of 59.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 5526 from 5585, we get 59.
Append the next digit (7) from the dividend to 59 and continue with: 597 / 921

On to step 5:
597 divided by 921 is 0 with a remainder of 597.
Use 0 as the next digit of our solution. 
Result so far: 60.0
Subtracting 0 from 597 leaves us with 597.
Append the next digit (3) from the dividend to 597 and continue with: 5973 / 921

Advancing to step 6:
5973 divided by 921 is 6 with a remainder of 447.
Put 6 as the next digit of the answer. 
Result so far: 606.0
Subtract 5526 from 5973 to get 447.
Fetch the next digit (2) from the dividend, attach it to 447 and continue: 4472 / 921

Let's proceed to step 7:
The number 921 fits into 4472 4 times, leaving a remainder of 788.
The number 4 becomes the next digit in our result. 
Result so far: 6064.0
Deduct 3684 from 4472 and we're left with 788.
Fetch the next digit (1) from the dividend, attach it to 788 and continue: 7881 / 921

Going ahead to step 8:
When dividing 7881 by 921, we get 8 with a remainder of 513.
Put 8 as the next digit of the answer. 
Result so far: 60648.0
Deduct 7368 from 7881 and we're left with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

On to step 9:
When dividing 5130 by 921, we get 5 with a remainder of 525.
Use 5 as the next digit of our solution. 
Result so far: 60648.5
If we subtract 4605 from 5130, we get 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

Moving on to step 10:
The number 921 fits into 5250 5 times, leaving a remainder of 645.
The number 5 becomes the next digit in our result. 
Result so far: 60648.55
The remainder is 645 after subtracting 4605 from 5250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

The final outcome is 60648.55, with a leftover of 0.645.