423929 ÷ 3 
The aim is to understand the frequency of 3 in 423929.

Let's proceed 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
Deduct 3 from 4 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 3

Advancing to step 2:
3 goes into 12 4 times with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we take 12 away from 12, we end up with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 3

Going ahead to step 3:
3 divided by 3 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 141.0
Deduct 3 from 3 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

Step 4:
The number 3 fits into 9 3 times, leaving a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 1413.0
Subtract 9 from 9 to get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 3

Moving on to step 5:
When dividing 2 by 3, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 14130.0
Subtract 0 from 2 to get 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 3

Let's proceed to step 6:
3 goes into 29 9 times with a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 141309.0
Deduct 27 from 29 and we're left 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.

Let's proceed to step 7:
When dividing 20 by 3, we get 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 141309.6
If we take 18 away from 20, we end up 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.

On to step 8:
3 goes into 20 6 times with a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 141309.66
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.

After the division, we end up with 141309.66 and a remainder of 0.002.