18591593 ÷ 921 
The aim is to understand the frequency of 921 in 18591593.

Advancing to step 1:
1 divided by 921 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 921

Let's proceed to step 2:
921 goes into 18 0 times with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 18 leaves us with 18.
Bring next digit (5) of the dividend behind the 18 and repeat the process: 185 / 921

On to step 3:
921 goes into 185 0 times with a remainder of 185.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 185 after subtracting 0 from 185.
Include the next digit (9) from the dividend after 185, then repeat: 1859 / 921

On to step 4:
1859 divided by 921 is 2 with a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 1842 from 1859, we get 17.
Grab the next digit (1) from the dividend, add it to 17, then carry on: 171 / 921

On to step 5:
171 divided by 921 is 0 with a remainder of 171.
The next digit of our result is 0. 
Result so far: 20.0
Subtract 0 from 171 to get 171.
Fetch the next digit (5) from the dividend, attach it to 171 and continue: 1715 / 921

On to step 6:
The number 921 fits into 1715 1 times, leaving a remainder of 794.
Put 1 as the next digit of the answer. 
Result so far: 201.0
If we subtract 921 from 1715, we get 794.
Append the next digit (9) from the dividend to 794 and continue with: 7949 / 921

Let's proceed to step 7:
When dividing 7949 by 921, we get 8 with a remainder of 581.
The number 8 becomes the next digit in our result. 
Result so far: 2018.0
The remainder is 581 after subtracting 7368 from 7949.
Include the next digit (3) from the dividend after 581, then repeat: 5813 / 921

Let's proceed to step 8:
5813 divided by 921 is 6 with a remainder of 287.
Use 6 as the next digit of our solution. 
Result so far: 20186.0
Subtract 5526 from 5813 to get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Step 9:
If we divide 2870 by 921, we get 3 and a remainder of 107.
Use 3 as the next digit of our solution. 
Result so far: 20186.3
Subtracting 2763 from 2870 leaves us with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

On to step 10:
921 goes into 1070 1 times with a remainder of 149.
The number 1 becomes the next digit in our result. 
Result so far: 20186.31
Subtracting 921 from 1070 leaves us with 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:
The number 921 fits into 1490 1 times, leaving a remainder of 569.
Write down 1 as next digit of the result. 
Result so far: 20186.311
Subtract 921 from 1490 to get 569.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5690, and continue the process.

The final outcome is 20186.311, with a leftover of 0.0569.