We're dividing 80990631 by 405 
Let's see how many times 405 fits into 80990631.

Moving on to step 1:
405 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 405

Advancing to step 2:
405 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Take the next digit (9) from the dividend and append it to 80, then repeat: 809 / 405

Step 3:
The number 405 fits into 809 1 times, leaving a remainder of 404.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 405 from 809 to get 404.
Take the next digit (9) from the dividend and append it to 404, then repeat: 4049 / 405

Let's proceed to step 4:
405 can be fit into 4049 9 times, resulting in a remainder of 404.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we take 3645 away from 4049, we end up with 404.
Include the next digit (0) from the dividend after 404, then repeat: 4040 / 405

Advancing to step 5:
405 can be fit into 4040 9 times, resulting in a remainder of 395.
The next digit of our result is 9. 
Result so far: 199.0
If we take 3645 away from 4040, we end up with 395.
Append the next digit (6) from the dividend to 395 and continue with: 3956 / 405

Advancing to step 6:
The number 405 fits into 3956 9 times, leaving a remainder of 311.
Write down 9 as next digit of the result. 
Result so far: 1999.0
If we subtract 3645 from 3956, we get 311.
Take the next digit (3) from the dividend and append it to 311, then repeat: 3113 / 405

Moving on to step 7:
3113 divided by 405 is 7 with a remainder of 278.
Put 7 as the next digit of the answer. 
Result so far: 19997.0
Subtract 2835 from 3113 to get 278.
Append the next digit (1) from the dividend to 278 and continue with: 2781 / 405

Advancing to step 8:
405 can be fit into 2781 6 times, resulting in a remainder of 351.
Put 6 as the next digit of the answer. 
Result so far: 199976.0
If we subtract 2430 from 2781, we get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Moving on to step 9:
3510 divided by 405 is 8 with a remainder of 270.
Use 8 as the next digit of our solution. 
Result so far: 199976.8
The remainder is 270 after subtracting 3240 from 3510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Let's proceed to step 10:
405 goes into 2700 6 times with a remainder of 270.
Use 6 as the next digit of our solution. 
Result so far: 199976.86
Subtract 2430 from 2700 to get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

On to step 11:
2700 divided by 405 is 6 with a remainder of 270.
Record the quotient 6 as the next digit in the result. 
Result so far: 199976.866
The remainder is 270 after subtracting 2430 from 2700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

After the division, we end up with 199976.866 and a remainder of 0.027.