843557 divided by 13 
The aim is to understand the frequency of 13 in 843557.

Step 1:
13 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 13

Advancing to step 2:
13 goes into 84 6 times with a remainder of 6.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 78 from 84, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 13

Advancing to step 3:
The number 13 fits into 63 4 times, leaving a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 64.0
Subtract 52 from 63 to get 11.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 13

Step 4:
The number 13 fits into 115 8 times, leaving a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 648.0
The remainder is 11 after subtracting 104 from 115.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 13

Moving on to step 5:
13 goes into 115 8 times with a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 6488.0
Deduct 104 from 115 and we're left with 11.
Grab the next digit (7) from the dividend, add it to 11, then carry on: 117 / 13

Going ahead to step 6:
If we divide 117 by 13, we get 9 and a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 64889.0
Deduct 117 from 117 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
13 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 64889.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
0 divided by 13 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 64889.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 64889.0 and a remainder of 0.0.