512490 ÷ 3 
The aim is to understand the frequency of 3 in 512490.

Let's proceed to step 1:
When dividing 5 by 3, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 2 after subtracting 3 from 5.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 3

Going ahead to step 2:
3 goes into 21 7 times with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we subtract 21 from 21, we get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 3

Moving on to step 3:
The number 3 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 170.0
Subtract 0 from 2 to get 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 3

On to step 4:
24 divided by 3 is 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 1708.0
Deduct 24 from 24 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

Moving on to step 5:
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: 17083.0
If we subtract 9 from 9, we get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 3

Step 6:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 170830.0
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.

Let's proceed to step 7:
When dividing 0 by 3, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 170830.0
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.

Step 8:
0 divided by 3 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 170830.0
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.

After the division, we end up with 170830.0 and a remainder of 0.0.