We're dividing 750436 by 3 
The aim is to understand the frequency of 3 in 750436.

Step 1:
3 goes into 7 2 times with a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 6 away from 7, we end up with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 3

Moving on to step 2:
3 can be fit into 15 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
The remainder is 0 after subtracting 15 from 15.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 3

Going ahead to step 3:
If we divide 0 by 3, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 250.0
Subtract 0 from 0 to get 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 3

Advancing to step 4:
When dividing 4 by 3, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 2501.0
Subtracting 3 from 4 leaves us with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 3

Going ahead to step 5:
When dividing 13 by 3, we get 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 25014.0
If we subtract 12 from 13, we get 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 3

Moving on to step 6:
16 divided by 3 is 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 250145.0
The remainder is 1 after subtracting 15 from 16.
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:
3 goes into 10 3 times with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 250145.3
Deduct 9 from 10 and we're left 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.

Moving on to step 8:
When dividing 10 by 3, we get 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 250145.33
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 250145.33 with a remainder of 0.001.