90345354 ÷ 843 
The aim is to understand the frequency of 843 in 90345354.

On to step 1:
If we divide 9 by 843, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 843

Step 2:
90 divided by 843 is 0 with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 90 leaves us with 90.
Fetch the next digit (3) from the dividend, attach it to 90 and continue: 903 / 843

Moving on to step 3:
843 goes into 903 1 times with a remainder of 60.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 843 from 903 and we're left with 60.
Fetch the next digit (4) from the dividend, attach it to 60 and continue: 604 / 843

Going ahead to step 4:
The number 843 fits into 604 0 times, leaving a remainder of 604.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 604, we get 604.
Bring next digit (5) of the dividend behind the 604 and repeat the process: 6045 / 843

Going ahead to step 5:
The number 843 fits into 6045 7 times, leaving a remainder of 144.
Use 7 as the next digit of our solution. 
Result so far: 107.0
Subtract 5901 from 6045 to get 144.
Grab the next digit (3) from the dividend, add it to 144, then carry on: 1443 / 843

Moving on to step 6:
The number 843 fits into 1443 1 times, leaving a remainder of 600.
Use 1 as the next digit of our solution. 
Result so far: 1071.0
If we take 843 away from 1443, we end up with 600.
Bring next digit (5) of the dividend behind the 600 and repeat the process: 6005 / 843

Step 7:
If we divide 6005 by 843, we get 7 and a remainder of 104.
Record the quotient 7 as the next digit in the result. 
Result so far: 10717.0
Subtracting 5901 from 6005 leaves us with 104.
Take the next digit (4) from the dividend and append it to 104, then repeat: 1044 / 843

Step 8:
1044 divided by 843 is 1 with a remainder of 201.
Use 1 as the next digit of our solution. 
Result so far: 107171.0
Subtract 843 from 1044 to get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Step 9:
843 can be fit into 2010 2 times, resulting in a remainder of 324.
The next digit of our result is 2. 
Result so far: 107171.2
If we subtract 1686 from 2010, we get 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Let's proceed to step 10:
When dividing 3240 by 843, we get 3 with a remainder of 711.
Put 3 as the next digit of the answer. 
Result so far: 107171.23
The remainder is 711 after subtracting 2529 from 3240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7110, and continue the process.

Step 11:
If we divide 7110 by 843, we get 8 and a remainder of 366.
Record the quotient 8 as the next digit in the result. 
Result so far: 107171.238
The remainder is 366 after subtracting 6744 from 7110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Step 12:
If we divide 3660 by 843, we get 4 and a remainder of 288.
Put 4 as the next digit of the answer. 
Result so far: 107171.2384
If we subtract 3372 from 3660, we get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Going ahead to step 13:
The number 843 fits into 2880 3 times, leaving a remainder of 351.
Use 3 as the next digit of our solution. 
Result so far: 107171.23843
Subtract 2529 from 2880 to get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Step 14:
If we divide 3510 by 843, we get 4 and a remainder of 138.
Use 4 as the next digit of our solution. 
Result so far: 107171.238434
If we take 3372 away from 3510, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Going ahead to step 15:
When dividing 1380 by 843, we get 1 with a remainder of 537.
Use 1 as the next digit of our solution. 
Result so far: 107171.2384341
If we take 843 away from 1380, we end up with 537.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5370, and continue the process.

Advancing to step 16:
843 can be fit into 5370 6 times, resulting in a remainder of 312.
The number 6 becomes the next digit in our result. 
Result so far: 107171.23843416
The remainder is 312 after subtracting 5058 from 5370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Our division results in 107171.23843416 with a remaining 3.12e-07.