We're dividing 43423861 by 129 
We want to figure out the number of times 43423861 can be divided by 129.

Going ahead to step 1:
If we divide 4 by 129, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 129

Advancing to step 2:
129 goes into 43 0 times with a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 43 after subtracting 0 from 43.
Fetch the next digit (4) from the dividend, attach it to 43 and continue: 434 / 129

On to step 3:
If we divide 434 by 129, we get 3 and a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 387 from 434 to get 47.
Grab the next digit (2) from the dividend, add it to 47, then carry on: 472 / 129

Step 4:
The number 129 fits into 472 3 times, leaving a remainder of 85.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Deduct 387 from 472 and we're left with 85.
Include the next digit (3) from the dividend after 85, then repeat: 853 / 129

Moving on to step 5:
If we divide 853 by 129, we get 6 and a remainder of 79.
The number 6 becomes the next digit in our result. 
Result so far: 336.0
If we take 774 away from 853, we end up with 79.
Fetch the next digit (8) from the dividend, attach it to 79 and continue: 798 / 129

Going ahead to step 6:
129 can be fit into 798 6 times, resulting in a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 3366.0
Subtracting 774 from 798 leaves us with 24.
Bring next digit (6) of the dividend behind the 24 and repeat the process: 246 / 129

Advancing to step 7:
129 can be fit into 246 1 times, resulting in a remainder of 117.
Record the quotient 1 as the next digit in the result. 
Result so far: 33661.0
If we take 129 away from 246, we end up with 117.
Append the next digit (1) from the dividend to 117 and continue with: 1171 / 129

On to step 8:
129 goes into 1171 9 times with a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 336619.0
If we take 1161 away from 1171, we end up 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 9:
100 divided by 129 is 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 336619.0
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.

Moving on to step 10:
If we divide 1000 by 129, we get 7 and a remainder of 97.
The number 7 becomes the next digit in our result. 
Result so far: 336619.07
If we take 903 away from 1000, we end up with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Moving on to step 11:
If we divide 970 by 129, we get 7 and a remainder of 67.
Write down 7 as next digit of the result. 
Result so far: 336619.077
If we take 903 away from 970, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

After the division, we end up with 336619.077 and a remainder of 0.0067.