We're dividing 909439 by 75 
We're looking to find how many times 75 goes into 909439.

Going ahead to step 1:
If we divide 9 by 75, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 75

Advancing to step 2:
75 goes into 90 1 times with a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 75 from 90 and we're left with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 75

Step 3:
The number 75 fits into 159 2 times, leaving a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we take 150 away from 159, we end up with 9.
Grab the next digit (4) from the dividend, add it to 9, then carry on: 94 / 75

On to step 4:
The number 75 fits into 94 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 121.0
The remainder is 19 after subtracting 75 from 94.
Append the next digit (3) from the dividend to 19 and continue with: 193 / 75

Step 5:
If we divide 193 by 75, we get 2 and a remainder of 43.
The number 2 becomes the next digit in our result. 
Result so far: 1212.0
The remainder is 43 after subtracting 150 from 193.
Take the next digit (9) from the dividend and append it to 43, then repeat: 439 / 75

Step 6:
75 can be fit into 439 5 times, resulting in a remainder of 64.
Put 5 as the next digit of the answer. 
Result so far: 12125.0
The remainder is 64 after subtracting 375 from 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 7:
640 divided by 75 is 8 with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 12125.8
If we take 600 away from 640, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 8:
75 can be fit into 400 5 times, resulting in a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 12125.85
If we take 375 away from 400, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
75 goes into 250 3 times with a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 12125.853
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 10:
75 goes into 250 3 times with a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 12125.8533
Subtract 225 from 250 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

After the division, we end up with 12125.8533 and a remainder of 0.00025.