We look at the division of 309665 by 80 
Let's see how many times 80 fits into 309665.

Step 1:
3 divided by 80 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 80

Moving on to step 2:
When dividing 30 by 80, we get 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 80

Step 3:
The number 80 fits into 309 3 times, leaving a remainder of 69.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 69 after subtracting 240 from 309.
Append the next digit (6) from the dividend to 69 and continue with: 696 / 80

Moving on to step 4:
The number 80 fits into 696 8 times, leaving a remainder of 56.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Subtract 640 from 696 to get 56.
Take the next digit (6) from the dividend and append it to 56, then repeat: 566 / 80

Let's proceed to step 5:
80 goes into 566 7 times with a remainder of 6.
The next digit of our result is 7. 
Result so far: 387.0
Subtracting 560 from 566 leaves us with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 80

On to step 6:
80 goes into 65 0 times with a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 3870.0
Deduct 0 from 65 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 7:
80 goes into 650 8 times with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 3870.8
Deduct 640 from 650 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
If we divide 100 by 80, we get 1 and a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 3870.81
Deduct 80 from 100 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 3870.812
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
When dividing 400 by 80, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 3870.8125
If we take 400 away from 400, 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.

Going ahead to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3870.8125
Deduct 0 from 0 and we're left 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.

Let's proceed to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 3870.8125
Deduct 0 from 0 and we're left 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 quotient of the division is 3870.8125, and the remainder is 0.0.