Let's divide 903645 by 3
We want to figure out the number of times 903645 can be divided by 3.

Step 1:
The number 3 fits into 9 3 times, leaving a remainder of 0.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 0 after subtracting 9 from 9.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 3

Moving on to step 2:
If we divide 0 by 3, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 30.0
If we take 0 away from 0, we end up with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 3

Advancing to step 3:
If we divide 3 by 3, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 301.0
Deduct 3 from 3 and we're left with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 3

Advancing to step 4:
The number 3 fits into 6 2 times, leaving a remainder of 0.
The next digit of our result is 2. 
Result so far: 3012.0
Subtracting 6 from 6 leaves us with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 3

Step 5:
The number 3 fits into 4 1 times, leaving a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 30121.0
Subtracting 3 from 4 leaves us with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 3

Step 6:
The number 3 fits into 15 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 301215.0
If we subtract 15 from 15, 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.

Step 7:
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: 301215.0
If we take 0 away from 0, we end up 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.

On to step 8:
0 divided by 3 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 301215.0
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.

In conclusion, the division gives 301215.0 with a balance of 0.0.