We divide 903894 by 3
The aim is to understand the frequency of 3 in 903894.

Moving on to step 1:
When dividing 9 by 3, we get 3 with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 9 from 9 to get 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 3

Let's proceed to step 2:
3 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 30.0
Subtracting 0 from 0 leaves us with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 3

Moving on to step 3:
The number 3 fits into 3 1 times, leaving a remainder of 0.
The next digit of our result is 1. 
Result so far: 301.0
Subtract 3 from 3 to get 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 3

Moving on to step 4:
The number 3 fits into 8 2 times, leaving a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 3012.0
Subtracting 6 from 8 leaves us with 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 3

Step 5:
The number 3 fits into 29 9 times, leaving a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 30129.0
If we subtract 27 from 29, we get 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 3

On to step 6:
The number 3 fits into 24 8 times, leaving a remainder of 0.
The next digit of our result is 8. 
Result so far: 301298.0
Deduct 24 from 24 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.

Going ahead to step 7:
When dividing 0 by 3, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 301298.0
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 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 301298.0
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.

The final result is 301298.0 with a remainder of 0.0.