866989 ÷ 6 
The aim is to understand the frequency of 6 in 866989.

Let's proceed to step 1:
6 can be fit into 8 1 times, resulting in a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 6 from 8 and we're left with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 6

Going ahead to step 2:
The number 6 fits into 26 4 times, leaving a remainder of 2.
The next digit of our result is 4. 
Result so far: 14.0
Subtracting 24 from 26 leaves us with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 6

On to step 3:
When dividing 26 by 6, we get 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 144.0
Subtract 24 from 26 to get 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 6

Moving on to step 4:
When dividing 29 by 6, we get 4 with a remainder of 5.
The next digit of our result is 4. 
Result so far: 1444.0
If we take 24 away from 29, we end up with 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 6

Advancing to step 5:
6 goes into 58 9 times with a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 14449.0
Subtract 54 from 58 to get 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 6

Let's proceed to step 6:
6 can be fit into 49 8 times, resulting in a remainder of 1.
The next digit of our result is 8. 
Result so far: 144498.0
Subtract 48 from 49 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
10 divided by 6 is 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 144498.1
If we take 6 away from 10, 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.

Moving on to step 8:
6 goes into 40 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 144498.16
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
6 goes into 40 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 144498.166
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 144498.166 with a remainder of 0.0004.