Let's divide 485619 by 3
The aim is to understand the frequency of 3 in 485619.

On to 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
Subtract 3 from 4 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 3

Advancing to step 2:
18 divided by 3 is 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
The remainder is 0 after subtracting 18 from 18.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 3

Moving on to step 3:
3 goes into 5 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 161.0
The remainder is 2 after subtracting 3 from 5.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 3

Moving on to step 4:
3 can be fit into 26 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1618.0
The remainder is 2 after subtracting 24 from 26.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 3

On to step 5:
3 goes into 21 7 times with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 16187.0
Subtract 21 from 21 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 3

Moving on to step 6:
3 can be fit into 9 3 times, resulting in a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 161873.0
If we take 9 away from 9, 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.

Step 7:
0 divided by 3 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 161873.0
Subtracting 0 from 0 leaves us 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.

Advancing to step 8:
If we divide 0 by 3, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 161873.0
Subtracting 0 from 0 leaves us 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.

The final result is 161873.0 with a remainder of 0.0.