We're dividing 643955 by 8 
The aim is to understand the frequency of 8 in 643955.

On to step 1:
When dividing 6 by 8, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 8

Let's proceed to step 2:
When dividing 64 by 8, we get 8 with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 0 after subtracting 64 from 64.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 8

Let's proceed to step 3:
If we divide 3 by 8, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 8

Advancing to step 4:
39 divided by 8 is 4 with a remainder of 7.
The next digit of our result is 4. 
Result so far: 804.0
Subtract 32 from 39 to get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 8

Let's proceed to step 5:
8 goes into 75 9 times with a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 8049.0
Deduct 72 from 75 and we're left with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 8

Advancing to step 6:
If we divide 35 by 8, we get 4 and a remainder of 3.
The next digit of our result is 4. 
Result so far: 80494.0
Subtracting 32 from 35 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
30 divided by 8 is 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 80494.3
Subtracting 24 from 30 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
If we divide 60 by 8, we get 7 and a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 80494.37
If we take 56 away from 60, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
40 divided by 8 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 80494.375
Subtracting 40 from 40 leaves us 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 10:
0 divided by 8 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 80494.375
Subtracting 0 from 0 leaves us 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.

Step 11:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 80494.375
The remainder is 0 after subtracting 0 from 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 80494.375 and a remainder of 0.0.