80619099 divided by 309 
Our goal is to divide 80619099 by 309.

On to step 1:
If we divide 8 by 309, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 309

On to step 2:
309 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Include the next digit (6) from the dividend after 80, then repeat: 806 / 309

Let's proceed to step 3:
309 can be fit into 806 2 times, resulting in a remainder of 188.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 618 from 806 to get 188.
Bring next digit (1) of the dividend behind the 188 and repeat the process: 1881 / 309

On to step 4:
The number 309 fits into 1881 6 times, leaving a remainder of 27.
The next digit of our result is 6. 
Result so far: 26.0
Subtract 1854 from 1881 to get 27.
Include the next digit (9) from the dividend after 27, then repeat: 279 / 309

Going ahead to step 5:
309 goes into 279 0 times with a remainder of 279.
The number 0 becomes the next digit in our result. 
Result so far: 260.0
The remainder is 279 after subtracting 0 from 279.
Grab the next digit (0) from the dividend, add it to 279, then carry on: 2790 / 309

On to step 6:
The number 309 fits into 2790 9 times, leaving a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 2609.0
The remainder is 9 after subtracting 2781 from 2790.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 309

Advancing to step 7:
The number 309 fits into 99 0 times, leaving a remainder of 99.
The next digit of our result is 0. 
Result so far: 26090.0
Subtract 0 from 99 to get 99.
Fetch the next digit (9) from the dividend, attach it to 99 and continue: 999 / 309

Let's proceed to step 8:
The number 309 fits into 999 3 times, leaving a remainder of 72.
Use 3 as the next digit of our solution. 
Result so far: 260903.0
Deduct 927 from 999 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 9:
720 divided by 309 is 2 with a remainder of 102.
Record the quotient 2 as the next digit in the result. 
Result so far: 260903.2
If we subtract 618 from 720, we get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Let's proceed to step 10:
The number 309 fits into 1020 3 times, leaving a remainder of 93.
The number 3 becomes the next digit in our result. 
Result so far: 260903.23
Subtract 927 from 1020 to get 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

On to step 11:
309 goes into 930 3 times with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 260903.233
If we subtract 927 from 930, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

In conclusion, the division gives 260903.233 with a balance of 0.0003.