Let's divide 80139569 by 129
We want to divide 80139569 by 129.

Step 1:
The number 129 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 129

Let's proceed to step 2:
If we divide 80 by 129, we get 0 and a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Take the next digit (1) from the dividend and append it to 80, then repeat: 801 / 129

On to step 3:
801 divided by 129 is 6 with a remainder of 27.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 774 from 801 leaves us with 27.
Bring next digit (3) of the dividend behind the 27 and repeat the process: 273 / 129

Let's proceed to step 4:
When dividing 273 by 129, we get 2 with a remainder of 15.
The next digit of our result is 2. 
Result so far: 62.0
If we subtract 258 from 273, we get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 129

On to step 5:
If we divide 159 by 129, we get 1 and a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 621.0
If we take 129 away from 159, we end up with 30.
Take the next digit (5) from the dividend and append it to 30, then repeat: 305 / 129

Step 6:
305 divided by 129 is 2 with a remainder of 47.
The number 2 becomes the next digit in our result. 
Result so far: 6212.0
Subtract 258 from 305 to get 47.
Fetch the next digit (6) from the dividend, attach it to 47 and continue: 476 / 129

Step 7:
If we divide 476 by 129, we get 3 and a remainder of 89.
Write down 3 as next digit of the result. 
Result so far: 62123.0
The remainder is 89 after subtracting 387 from 476.
Bring next digit (9) of the dividend behind the 89 and repeat the process: 899 / 129

Let's proceed to step 8:
If we divide 899 by 129, we get 6 and a remainder of 125.
Use 6 as the next digit of our solution. 
Result so far: 621236.0
If we take 774 away from 899, we end up with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 9:
If we divide 1250 by 129, we get 9 and a remainder of 89.
Write down 9 as next digit of the result. 
Result so far: 621236.9
If we take 1161 away from 1250, we end up with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 10:
890 divided by 129 is 6 with a remainder of 116.
The number 6 becomes the next digit in our result. 
Result so far: 621236.96
The remainder is 116 after subtracting 774 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Step 11:
129 goes into 1160 8 times with a remainder of 128.
Write down 8 as next digit of the result. 
Result so far: 621236.968
If we subtract 1032 from 1160, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 12:
129 can be fit into 1280 9 times, resulting in a remainder of 119.
The next digit of our result is 9. 
Result so far: 621236.9689
If we subtract 1161 from 1280, we get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 13:
The number 129 fits into 1190 9 times, leaving a remainder of 29.
The next digit of our result is 9. 
Result so far: 621236.96899
If we subtract 1161 from 1190, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 621236.96899 with a remainder of 2.9e-05.