We're dividing 804399 by 10 
The aim is to understand the frequency of 10 in 804399.

Moving on to step 1:
10 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 10

Let's proceed to step 2:
10 can be fit into 80 8 times, resulting in a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we take 80 away from 80, we end up with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 10

On to step 3:
10 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 80.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 10

On to step 4:
The number 10 fits into 43 4 times, leaving a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 804.0
Deduct 40 from 43 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 10

Advancing to step 5:
39 divided by 10 is 3 with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 8043.0
Deduct 30 from 39 and we're left with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 10

Advancing to step 6:
10 goes into 99 9 times with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 80439.0
Subtract 90 from 99 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
10 can be fit into 90 9 times, resulting in a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 80439.9
If we take 90 away from 90, 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.

Moving on to step 8:
10 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 80439.9
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.

On to step 9:
When dividing 0 by 10, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 80439.9
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.

The final result is 80439.9 with a remainder of 0.0.