788402 ÷ 3 
The aim is to understand the frequency of 3 in 788402.

Moving on to step 1:
If we divide 7 by 3, we get 2 and a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 6 from 7 to get 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 3

Step 2:
When dividing 18 by 3, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 26.0
Subtract 18 from 18 to get 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 3

Going ahead to step 3:
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: 262.0
The remainder is 2 after subtracting 6 from 8.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 3

On to step 4:
3 can be fit into 24 8 times, resulting in a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 2628.0
If we take 24 away from 24, we end up with 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 3

Advancing to step 5:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 26280.0
Subtracting 0 from 0 leaves us with 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 3

Step 6:
2 divided by 3 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 262800.0
If we take 0 away from 2, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
3 goes into 20 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 262800.6
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.

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: 262800.66
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 result is 262800.66 with a remainder of 0.002.