We look at the division of 625599 by 3 
The aim is to understand the frequency of 3 in 625599.

Step 1:
If we divide 6 by 3, we get 2 and a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 6 from 6, we get 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 3

Going ahead to step 2:
When dividing 2 by 3, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
If we subtract 0 from 2, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 3

Moving on to step 3:
The number 3 fits into 25 8 times, leaving a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 208.0
Subtracting 24 from 25 leaves us with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 3

Going ahead to step 4:
3 goes into 15 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 2085.0
Deduct 15 from 15 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

Advancing to step 5:
If we divide 9 by 3, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 20853.0
Subtracting 9 from 9 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

Going ahead to step 6:
3 can be fit into 9 3 times, resulting in a remainder of 0.
The next digit of our result is 3. 
Result so far: 208533.0
The remainder is 0 after subtracting 9 from 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
3 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 208533.0
The remainder is 0 after subtracting 0 from 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.
The number 0 becomes the next digit in our result. 
Result so far: 208533.0
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.

The final result is 208533.0 with a remainder of 0.0.