864001 divided by 3 
The aim is to understand the frequency of 3 in 864001.

Going ahead to step 1:
3 goes into 8 2 times with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 6 from 8, we get 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 3

On to step 2:
If we divide 26 by 3, we get 8 and a remainder of 2.
The next digit of our result is 8. 
Result so far: 28.0
If we subtract 24 from 26, we get 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 3

Advancing to step 3:
24 divided by 3 is 8 with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 288.0
Subtract 24 from 24 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 3

Let's proceed to step 4:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 2880.0
If we subtract 0 from 0, we get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 3

Let's proceed to step 5:
If we divide 0 by 3, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28800.0
Subtract 0 from 0 to get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 3

Advancing to step 6:
3 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 288000.0
The remainder is 1 after subtracting 0 from 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
10 divided by 3 is 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 288000.3
Subtract 9 from 10 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.

Moving on to step 8:
When dividing 10 by 3, we get 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 288000.33
If we subtract 9 from 10, we 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.

Our division results in 288000.33 with a remaining 0.001.