We look at the division of 86403 by 6 
The aim is to understand the frequency of 6 in 86403.

Moving on to step 1:
8 divided by 6 is 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 6 from 8 leaves us with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 6

Advancing to step 2:
6 can be fit into 26 4 times, resulting in a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Deduct 24 from 26 and we're left with 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 6

Advancing to step 3:
When dividing 24 by 6, we get 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 144.0
Subtract 24 from 24 to get 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 6

Moving on to step 4:
6 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1440.0
Subtract 0 from 0 to get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 6

Let's proceed to step 5:
If we divide 3 by 6, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 14400.0
If we take 0 away from 3, we end up 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.

Advancing to step 6:
6 can be fit into 30 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 14400.5
The remainder is 0 after subtracting 30 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
The number 6 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 14400.5
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.

Step 8:
0 divided by 6 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 14400.5
Subtract 0 from 0 to 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 14400.5 and a remainder of 0.0.