Let's divide 429975 by 3
The aim is to understand the frequency of 3 in 429975.

Advancing to step 1:
3 goes into 4 1 times with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 1 after subtracting 3 from 4.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 3

Let's proceed to step 2:
3 can be fit into 12 4 times, resulting in a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 14.0
The remainder is 0 after subtracting 12 from 12.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 3

On to step 3:
If we divide 9 by 3, we get 3 and a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 143.0
The remainder is 0 after subtracting 9 from 9.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 3

Advancing to step 4:
3 goes into 9 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 1433.0
If we take 9 away from 9, we end up with 0.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 3

Going ahead to step 5:
7 divided by 3 is 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 14332.0
If we take 6 away from 7, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 3

Going ahead to step 6:
When dividing 15 by 3, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 143325.0
The remainder is 0 after subtracting 15 from 15.
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 7:
0 divided by 3 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 143325.0
Deduct 0 from 0 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 8:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 143325.0
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.

The final result is 143325.0 with a remainder of 0.0.