80663971 divided by 129 
We want to divide 80663971 by 129.

Moving on to step 1:
129 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 129

Moving on to step 2:
129 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
Deduct 0 from 80 and we're left with 80.
Append the next digit (6) from the dividend to 80 and continue with: 806 / 129

Advancing to step 3:
When dividing 806 by 129, we get 6 with a remainder of 32.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtract 774 from 806 to get 32.
Append the next digit (6) from the dividend to 32 and continue with: 326 / 129

Advancing to step 4:
129 can be fit into 326 2 times, resulting in a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 62.0
The remainder is 68 after subtracting 258 from 326.
Append the next digit (3) from the dividend to 68 and continue with: 683 / 129

Let's proceed to step 5:
The number 129 fits into 683 5 times, leaving a remainder of 38.
Put 5 as the next digit of the answer. 
Result so far: 625.0
If we subtract 645 from 683, we get 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 129

Let's proceed to step 6:
129 goes into 389 3 times with a remainder of 2.
The next digit of our result is 3. 
Result so far: 6253.0
If we take 387 away from 389, we end up with 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 129

Step 7:
129 can be fit into 27 0 times, resulting in a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 62530.0
Subtract 0 from 27 to get 27.
Grab the next digit (1) from the dividend, add it to 27, then carry on: 271 / 129

Advancing to step 8:
The number 129 fits into 271 2 times, leaving a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 625302.0
If we subtract 258 from 271, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 9:
130 divided by 129 is 1 with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 625302.1
The remainder is 1 after subtracting 129 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 10:
The number 129 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 625302.1
Deduct 0 from 10 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.

Step 11:
If we divide 100 by 129, we get 0 and a remainder of 100.
Put 0 as the next digit of the answer. 
Result so far: 625302.1
If we subtract 0 from 100, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final result is 625302.1 with a remainder of 0.01.