We're dividing 629389 by 3 
The aim is to understand the frequency of 3 in 629389.

Going ahead to step 1:
When dividing 6 by 3, we get 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 6 from 6 and we're left with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 3

Going ahead to step 2:
3 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 3

Let's proceed to step 3:
The number 3 fits into 29 9 times, leaving a remainder of 2.
The next digit of our result is 9. 
Result so far: 209.0
Deduct 27 from 29 and we're left with 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 3

On to step 4:
23 divided by 3 is 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 2097.0
Subtract 21 from 23 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 3

On to step 5:
The number 3 fits into 28 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 20979.0
If we take 27 away from 28, we end up with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 3

Advancing to step 6:
The number 3 fits into 19 6 times, leaving a remainder of 1.
The next digit of our result is 6. 
Result so far: 209796.0
The remainder is 1 after subtracting 18 from 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
When dividing 10 by 3, we get 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 209796.3
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
When dividing 10 by 3, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 209796.33
If we take 9 away from 10, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 209796.33 with a remainder of 0.001.