We look at the division of 71991831 by 420 
We want to divide 71991831 by 420.

Going ahead to step 1:
If we divide 7 by 420, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 420

On to step 2:
The number 420 fits into 71 0 times, leaving a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 71, we get 71.
Include the next digit (9) from the dividend after 71, then repeat: 719 / 420

Going ahead to step 3:
420 can be fit into 719 1 times, resulting in a remainder of 299.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 299 after subtracting 420 from 719.
Bring next digit (9) of the dividend behind the 299 and repeat the process: 2999 / 420

Advancing to step 4:
420 can be fit into 2999 7 times, resulting in a remainder of 59.
The next digit of our result is 7. 
Result so far: 17.0
Subtract 2940 from 2999 to get 59.
Grab the next digit (1) from the dividend, add it to 59, then carry on: 591 / 420

Going ahead to step 5:
591 divided by 420 is 1 with a remainder of 171.
Record the quotient 1 as the next digit in the result. 
Result so far: 171.0
Subtracting 420 from 591 leaves us with 171.
Append the next digit (8) from the dividend to 171 and continue with: 1718 / 420

Let's proceed to step 6:
The number 420 fits into 1718 4 times, leaving a remainder of 38.
The number 4 becomes the next digit in our result. 
Result so far: 1714.0
Subtract 1680 from 1718 to get 38.
Take the next digit (3) from the dividend and append it to 38, then repeat: 383 / 420

Moving on to step 7:
The number 420 fits into 383 0 times, leaving a remainder of 383.
Use 0 as the next digit of our solution. 
Result so far: 17140.0
Subtracting 0 from 383 leaves us with 383.
Fetch the next digit (1) from the dividend, attach it to 383 and continue: 3831 / 420

Advancing to step 8:
420 goes into 3831 9 times with a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 171409.0
If we subtract 3780 from 3831, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 9:
420 goes into 510 1 times with a remainder of 90.
Record the quotient 1 as the next digit in the result. 
Result so far: 171409.1
Deduct 420 from 510 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 10:
When dividing 900 by 420, we get 2 with a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 171409.12
Deduct 840 from 900 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 11:
420 can be fit into 600 1 times, resulting in a remainder of 180.
Use 1 as the next digit of our solution. 
Result so far: 171409.121
If we take 420 away from 600, we end up with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 12:
420 goes into 1800 4 times with a remainder of 120.
The number 4 becomes the next digit in our result. 
Result so far: 171409.1214
If we take 1680 away from 1800, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 13:
420 can be fit into 1200 2 times, resulting in a remainder of 360.
Put 2 as the next digit of the answer. 
Result so far: 171409.12142
Subtract 840 from 1200 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 14:
3600 divided by 420 is 8 with a remainder of 240.
The number 8 becomes the next digit in our result. 
Result so far: 171409.121428
Deduct 3360 from 3600 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 15:
2400 divided by 420 is 5 with a remainder of 300.
Record the quotient 5 as the next digit in the result. 
Result so far: 171409.1214285
If we subtract 2100 from 2400, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 16:
3000 divided by 420 is 7 with a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 171409.12142857
Subtracting 2940 from 3000 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 171409.12142857 with a remainder of 6e-08.