We're dividing 309156 by 75 
Let's see how many times 75 fits into 309156.

Advancing to step 1:
When dividing 3 by 75, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 75

Step 2:
75 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 30, we get 30.
Fetch the next digit (9) from the dividend, attach it to 30 and continue: 309 / 75

Moving on to step 3:
75 can be fit into 309 4 times, resulting in a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 9 after subtracting 300 from 309.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 75

Step 4:
If we divide 91 by 75, we get 1 and a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Subtract 75 from 91 to get 16.
Include the next digit (5) from the dividend after 16, then repeat: 165 / 75

Going ahead to step 5:
75 goes into 165 2 times with a remainder of 15.
The number 2 becomes the next digit in our result. 
Result so far: 412.0
The remainder is 15 after subtracting 150 from 165.
Include the next digit (6) from the dividend after 15, then repeat: 156 / 75

Advancing to step 6:
If we divide 156 by 75, we get 2 and a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 4122.0
If we subtract 150 from 156, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
If we divide 60 by 75, we get 0 and a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 4122.0
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
75 can be fit into 600 8 times, resulting in a remainder of 0.
The next digit of our result is 8. 
Result so far: 4122.08
If we subtract 600 from 600, we get 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 9:
When dividing 0 by 75, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4122.08
If we take 0 away from 0, we end up 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.

Advancing to step 10:
When dividing 0 by 75, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4122.08
Subtracting 0 from 0 leaves us 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 4122.08 with a remainder of 0.0.