31387890 divided by 129 
We're looking to find how many times 129 goes into 31387890.

Step 1:
129 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 129

Going ahead to step 2:
31 divided by 129 is 0 with a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Bring next digit (3) of the dividend behind the 31 and repeat the process: 313 / 129

On to step 3:
When dividing 313 by 129, we get 2 with a remainder of 55.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 258 from 313 leaves us with 55.
Bring next digit (8) of the dividend behind the 55 and repeat the process: 558 / 129

Step 4:
If we divide 558 by 129, we get 4 and a remainder of 42.
Put 4 as the next digit of the answer. 
Result so far: 24.0
Subtracting 516 from 558 leaves us with 42.
Bring next digit (7) of the dividend behind the 42 and repeat the process: 427 / 129

Advancing to step 5:
The number 129 fits into 427 3 times, leaving a remainder of 40.
The next digit of our result is 3. 
Result so far: 243.0
The remainder is 40 after subtracting 387 from 427.
Append the next digit (8) from the dividend to 40 and continue with: 408 / 129

Moving on to step 6:
129 goes into 408 3 times with a remainder of 21.
Write down 3 as next digit of the result. 
Result so far: 2433.0
Deduct 387 from 408 and we're left with 21.
Bring next digit (9) of the dividend behind the 21 and repeat the process: 219 / 129

Going ahead to step 7:
129 can be fit into 219 1 times, resulting in a remainder of 90.
Use 1 as the next digit of our solution. 
Result so far: 24331.0
Subtract 129 from 219 to get 90.
Include the next digit (0) from the dividend after 90, then repeat: 900 / 129

Advancing to step 8:
129 can be fit into 900 6 times, resulting in a remainder of 126.
Use 6 as the next digit of our solution. 
Result so far: 243316.0
If we subtract 774 from 900, we get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 9:
1260 divided by 129 is 9 with a remainder of 99.
The number 9 becomes the next digit in our result. 
Result so far: 243316.9
Deduct 1161 from 1260 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Step 10:
The number 129 fits into 990 7 times, leaving a remainder of 87.
The next digit of our result is 7. 
Result so far: 243316.97
Subtracting 903 from 990 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Going ahead to step 11:
When dividing 870 by 129, we get 6 with a remainder of 96.
The next digit of our result is 6. 
Result so far: 243316.976
Subtracting 774 from 870 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 12:
When dividing 960 by 129, we get 7 with a remainder of 57.
Put 7 as the next digit of the answer. 
Result so far: 243316.9767
Subtracting 903 from 960 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 13:
When dividing 570 by 129, we get 4 with a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 243316.97674
The remainder is 54 after subtracting 516 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 14:
If we divide 540 by 129, we get 4 and a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 243316.976744
Deduct 516 from 540 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The quotient of the division is 243316.976744, and the remainder is 2.4e-06.