We look at the division of 810669 by 3 
The aim is to understand the frequency of 3 in 810669.

Moving on to step 1:
3 can be fit into 8 2 times, resulting in a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 2 after subtracting 6 from 8.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 3

Moving on to step 2:
3 can be fit into 21 7 times, resulting in a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
Deduct 21 from 21 and we're left with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 3

Going ahead to step 3:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 270.0
Subtracting 0 from 0 leaves us with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 3

Let's proceed to step 4:
6 divided by 3 is 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2702.0
Subtracting 6 from 6 leaves us with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 3

On to step 5:
If we divide 6 by 3, we get 2 and a remainder of 0.
The next digit of our result is 2. 
Result so far: 27022.0
Deduct 6 from 6 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

On to step 6:
9 divided by 3 is 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 270223.0
Deduct 9 from 9 and we're left 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.

Let's proceed to step 7:
The number 3 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 270223.0
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 8:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 270223.0
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.

Our division results in 270223.0 with a remaining 0.0.