309390 divided by 80 
We want to divide 309390 by 80.

On to step 1:
3 divided by 80 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 80

Let's proceed to step 2:
80 can be fit into 30 0 times, resulting in a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 30 and we're left with 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 80

Moving on to step 3:
The number 80 fits into 309 3 times, leaving a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 69 after subtracting 240 from 309.
Bring next digit (3) of the dividend behind the 69 and repeat the process: 693 / 80

Moving on to step 4:
80 goes into 693 8 times with a remainder of 53.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Deduct 640 from 693 and we're left with 53.
Take the next digit (9) from the dividend and append it to 53, then repeat: 539 / 80

Let's proceed to step 5:
When dividing 539 by 80, we get 6 with a remainder of 59.
Use 6 as the next digit of our solution. 
Result so far: 386.0
If we subtract 480 from 539, we get 59.
Take the next digit (0) from the dividend and append it to 59, then repeat: 590 / 80

On to step 6:
When dividing 590 by 80, we get 7 with a remainder of 30.
The number 7 becomes the next digit in our result. 
Result so far: 3867.0
If we subtract 560 from 590, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 7:
80 can be fit into 300 3 times, resulting in a remainder of 60.
Record the quotient 3 as the next digit in the result. 
Result so far: 3867.3
Subtract 240 from 300 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 8:
600 divided by 80 is 7 with a remainder of 40.
Put 7 as the next digit of the answer. 
Result so far: 3867.37
If we take 560 away from 600, 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 9:
80 goes into 400 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 3867.375
If we subtract 400 from 400, 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.

Step 10:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 3867.375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3867.375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3867.375 and a remainder of 0.0.