40689380 ÷ 129 
We want to divide 40689380 by 129.

Let's proceed to step 1:
When dividing 4 by 129, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 129

Step 2:
40 divided by 129 is 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 40 to get 40.
Grab the next digit (6) from the dividend, add it to 40, then carry on: 406 / 129

Going ahead to step 3:
When dividing 406 by 129, we get 3 with a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 387 from 406 to get 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 129

Advancing to step 4:
198 divided by 129 is 1 with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Subtracting 129 from 198 leaves us with 69.
Take the next digit (9) from the dividend and append it to 69, then repeat: 699 / 129

Advancing to step 5:
129 goes into 699 5 times with a remainder of 54.
Write down 5 as next digit of the result. 
Result so far: 315.0
Subtracting 645 from 699 leaves us with 54.
Take the next digit (3) from the dividend and append it to 54, then repeat: 543 / 129

Let's proceed to step 6:
When dividing 543 by 129, we get 4 with a remainder of 27.
Put 4 as the next digit of the answer. 
Result so far: 3154.0
Deduct 516 from 543 and we're left with 27.
Bring next digit (8) of the dividend behind the 27 and repeat the process: 278 / 129

Advancing to step 7:
278 divided by 129 is 2 with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 31542.0
The remainder is 20 after subtracting 258 from 278.
Grab the next digit (0) from the dividend, add it to 20, then carry on: 200 / 129

Advancing to step 8:
129 can be fit into 200 1 times, resulting in a remainder of 71.
Record the quotient 1 as the next digit in the result. 
Result so far: 315421.0
If we subtract 129 from 200, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 9:
When dividing 710 by 129, we get 5 with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 315421.5
The remainder is 65 after subtracting 645 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 10:
129 can be fit into 650 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 315421.55
Deduct 645 from 650 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 315421.55, and the remainder is 0.005.