We look at the division of 38971580 by 129 
Our goal is to divide 38971580 by 129.

On to step 1:
The number 129 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 129

Going ahead to step 2:
When dividing 38 by 129, we get 0 with a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 38, we end up with 38.
Take the next digit (9) from the dividend and append it to 38, then repeat: 389 / 129

Going ahead to step 3:
The number 129 fits into 389 3 times, leaving a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 387 away from 389, we end up with 2.
Grab the next digit (7) from the dividend, add it to 2, then carry on: 27 / 129

Going ahead to step 4:
129 can be fit into 27 0 times, resulting in a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
If we subtract 0 from 27, we get 27.
Grab the next digit (1) from the dividend, add it to 27, then carry on: 271 / 129

Let's proceed to step 5:
129 can be fit into 271 2 times, resulting in a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 302.0
If we subtract 258 from 271, we get 13.
Append the next digit (5) from the dividend to 13 and continue with: 135 / 129

Advancing to step 6:
The number 129 fits into 135 1 times, leaving a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 3021.0
Deduct 129 from 135 and we're left with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 129

Advancing to step 7:
68 divided by 129 is 0 with a remainder of 68.
Write down 0 as next digit of the result. 
Result so far: 30210.0
Subtract 0 from 68 to get 68.
Fetch the next digit (0) from the dividend, attach it to 68 and continue: 680 / 129

Advancing to step 8:
680 divided by 129 is 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 302105.0
Subtracting 645 from 680 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 9:
The number 129 fits into 350 2 times, leaving a remainder of 92.
Use 2 as the next digit of our solution. 
Result so far: 302105.2
Subtracting 258 from 350 leaves us with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 10:
920 divided by 129 is 7 with a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 302105.27
Subtract 903 from 920 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
When dividing 170 by 129, we get 1 with a remainder of 41.
Record the quotient 1 as the next digit in the result. 
Result so far: 302105.271
Subtract 129 from 170 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 12:
When dividing 410 by 129, we get 3 with a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 302105.2713
Subtracting 387 from 410 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 13:
230 divided by 129 is 1 with a remainder of 101.
The number 1 becomes the next digit in our result. 
Result so far: 302105.27131
If we subtract 129 from 230, we get 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

On to step 14:
129 goes into 1010 7 times with a remainder of 107.
Use 7 as the next digit of our solution. 
Result so far: 302105.271317
The remainder is 107 after subtracting 903 from 1010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Step 15:
129 goes into 1070 8 times with a remainder of 38.
Write down 8 as next digit of the result. 
Result so far: 302105.2713178
Subtracting 1032 from 1070 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 16:
The number 129 fits into 380 2 times, leaving a remainder of 122.
Record the quotient 2 as the next digit in the result. 
Result so far: 302105.27131782
The remainder is 122 after subtracting 258 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

The final result is 302105.27131782 with a remainder of 1.22e-07.