Let's divide 485303 by 3
The aim is to understand the frequency of 3 in 485303.

Step 1:
4 divided by 3 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 3 from 4 leaves us with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 3

On to step 2:
3 goes into 18 6 times with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we subtract 18 from 18, we get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 3

On to step 3:
5 divided by 3 is 1 with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 161.0
If we subtract 3 from 5, we get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 3

Advancing to step 4:
3 goes into 23 7 times with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 1617.0
If we take 21 away from 23, we end up with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 3

Step 5:
The number 3 fits into 20 6 times, leaving a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 16176.0
If we subtract 18 from 20, we get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 3

Step 6:
When dividing 23 by 3, we get 7 with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 161767.0
Subtract 21 from 23 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.

On to step 7:
3 goes into 20 6 times with a remainder of 2.
The next digit of our result is 6. 
Result so far: 161767.6
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.

Let's proceed to step 8:
20 divided by 3 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 161767.66
Subtracting 18 from 20 leaves us 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.

The quotient of the division is 161767.66, and the remainder is 0.002.