We're dividing 85355121 by 873 
The aim is to understand the frequency of 873 in 85355121.

On to step 1:
873 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 873

Advancing to step 2:
873 can be fit into 85 0 times, resulting in a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Fetch the next digit (3) from the dividend, attach it to 85 and continue: 853 / 873

Advancing to step 3:
873 goes into 853 0 times with a remainder of 853.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 853 leaves us with 853.
Append the next digit (5) from the dividend to 853 and continue with: 8535 / 873

Going ahead to step 4:
If we divide 8535 by 873, we get 9 and a remainder of 678.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 7857 from 8535 to get 678.
Fetch the next digit (5) from the dividend, attach it to 678 and continue: 6785 / 873

Going ahead to step 5:
873 can be fit into 6785 7 times, resulting in a remainder of 674.
The next digit of our result is 7. 
Result so far: 97.0
The remainder is 674 after subtracting 6111 from 6785.
Grab the next digit (1) from the dividend, add it to 674, then carry on: 6741 / 873

Step 6:
873 can be fit into 6741 7 times, resulting in a remainder of 630.
Record the quotient 7 as the next digit in the result. 
Result so far: 977.0
The remainder is 630 after subtracting 6111 from 6741.
Take the next digit (2) from the dividend and append it to 630, then repeat: 6302 / 873

Step 7:
If we divide 6302 by 873, we get 7 and a remainder of 191.
Put 7 as the next digit of the answer. 
Result so far: 9777.0
If we take 6111 away from 6302, we end up with 191.
Bring next digit (1) of the dividend behind the 191 and repeat the process: 1911 / 873

Moving on to step 8:
873 goes into 1911 2 times with a remainder of 165.
Use 2 as the next digit of our solution. 
Result so far: 97772.0
The remainder is 165 after subtracting 1746 from 1911.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Going ahead to step 9:
873 goes into 1650 1 times with a remainder of 777.
The number 1 becomes the next digit in our result. 
Result so far: 97772.1
If we subtract 873 from 1650, we get 777.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7770, and continue the process.

Moving on to step 10:
7770 divided by 873 is 8 with a remainder of 786.
Write down 8 as next digit of the result. 
Result so far: 97772.18
Subtract 6984 from 7770 to get 786.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7860, and continue the process.

Let's proceed to step 11:
7860 divided by 873 is 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 97772.189
If we subtract 7857 from 7860, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 12:
873 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 97772.189
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 13:
300 divided by 873 is 0 with a remainder of 300.
The next digit of our result is 0. 
Result so far: 97772.189
If we subtract 0 from 300, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The quotient of the division is 97772.189, and the remainder is 0.0003.