We're dividing 755890 by 3 
The aim is to understand the frequency of 3 in 755890.

On to step 1:
The number 3 fits into 7 2 times, leaving a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 6 away from 7, we end up with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 3

Step 2:
15 divided by 3 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 15 from 15 to get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 3

On to step 3:
If we divide 5 by 3, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 251.0
Deduct 3 from 5 and we're left with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 3

Step 4:
The number 3 fits into 28 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 2519.0
Subtract 27 from 28 to get 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 3

Going ahead to step 5:
If we divide 19 by 3, we get 6 and a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 25196.0
Subtracting 18 from 19 leaves us with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 3

Advancing to step 6:
3 goes into 10 3 times with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 251963.0
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.

On to step 7:
If we divide 10 by 3, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 251963.3
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 8:
3 goes into 10 3 times with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 251963.33
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.

The final result is 251963.33 with a remainder of 0.001.