810560 ÷ 3 
The aim is to understand the frequency of 3 in 810560.

Going ahead to step 1:
When dividing 8 by 3, we get 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 6 from 8 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

Moving on to step 2:
If we divide 21 by 3, we get 7 and a remainder of 0.
The next digit of our result is 7. 
Result so far: 27.0
If we subtract 21 from 21, we get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 3

Step 3:
If we divide 0 by 3, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 270.0
If we subtract 0 from 0, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 3

Going ahead to step 4:
If we divide 5 by 3, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 2701.0
The remainder is 2 after subtracting 3 from 5.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 3

Let's proceed to step 5:
3 goes into 26 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 27018.0
Deduct 24 from 26 and we're left with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 3

On to step 6:
If we divide 20 by 3, we get 6 and a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 270186.0
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
3 goes into 20 6 times with a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 270186.6
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
When dividing 20 by 3, we get 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 270186.66
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 270186.66, with a leftover of 0.002.