We're dividing 42129121 by 753 
Let's see how many times 753 fits into 42129121.

On to step 1:
When dividing 4 by 753, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 753

Going ahead to step 2:
42 divided by 753 is 0 with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 753

Moving on to step 3:
421 divided by 753 is 0 with a remainder of 421.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 421 after subtracting 0 from 421.
Append the next digit (2) from the dividend to 421 and continue with: 4212 / 753

Step 4:
When dividing 4212 by 753, we get 5 with a remainder of 447.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Deduct 3765 from 4212 and we're left with 447.
Take the next digit (9) from the dividend and append it to 447, then repeat: 4479 / 753

Step 5:
4479 divided by 753 is 5 with a remainder of 714.
Put 5 as the next digit of the answer. 
Result so far: 55.0
Deduct 3765 from 4479 and we're left with 714.
Fetch the next digit (1) from the dividend, attach it to 714 and continue: 7141 / 753

Let's proceed to step 6:
7141 divided by 753 is 9 with a remainder of 364.
The number 9 becomes the next digit in our result. 
Result so far: 559.0
If we take 6777 away from 7141, we end up with 364.
Fetch the next digit (2) from the dividend, attach it to 364 and continue: 3642 / 753

Going ahead to step 7:
753 can be fit into 3642 4 times, resulting in a remainder of 630.
Put 4 as the next digit of the answer. 
Result so far: 5594.0
Subtract 3012 from 3642 to get 630.
Append the next digit (1) from the dividend to 630 and continue with: 6301 / 753

Moving on to step 8:
753 goes into 6301 8 times with a remainder of 277.
Put 8 as the next digit of the answer. 
Result so far: 55948.0
Deduct 6024 from 6301 and we're left with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 9:
753 goes into 2770 3 times with a remainder of 511.
The next digit of our result is 3. 
Result so far: 55948.3
Subtract 2259 from 2770 to get 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

Let's proceed to step 10:
753 goes into 5110 6 times with a remainder of 592.
Write down 6 as next digit of the result. 
Result so far: 55948.36
Subtract 4518 from 5110 to get 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Advancing to step 11:
753 can be fit into 5920 7 times, resulting in a remainder of 649.
Write down 7 as next digit of the result. 
Result so far: 55948.367
If we subtract 5271 from 5920, we get 649.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6490, and continue the process.

Going ahead to step 12:
When dividing 6490 by 753, we get 8 with a remainder of 466.
The number 8 becomes the next digit in our result. 
Result so far: 55948.3678
Subtracting 6024 from 6490 leaves us with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Let's proceed to step 13:
753 goes into 4660 6 times with a remainder of 142.
Write down 6 as next digit of the result. 
Result so far: 55948.36786
If we take 4518 away from 4660, we end up with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 14:
If we divide 1420 by 753, we get 1 and a remainder of 667.
Write down 1 as next digit of the result. 
Result so far: 55948.367861
Subtracting 753 from 1420 leaves us with 667.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6670, and continue the process.

Going ahead to step 15:
6670 divided by 753 is 8 with a remainder of 646.
Record the quotient 8 as the next digit in the result. 
Result so far: 55948.3678618
The remainder is 646 after subtracting 6024 from 6670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6460, and continue the process.

Step 16:
6460 divided by 753 is 8 with a remainder of 436.
Use 8 as the next digit of our solution. 
Result so far: 55948.36786188
Subtracting 6024 from 6460 leaves us with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Our division results in 55948.36786188 with a remaining 4.36e-07.