51421620 ÷ 831 
Let's see how many times 831 fits into 51421620.

Let's proceed to step 1:
When dividing 5 by 831, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 831

Moving on to step 2:
831 goes into 51 0 times with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Take the next digit (4) from the dividend and append it to 51, then repeat: 514 / 831

Going ahead to step 3:
The number 831 fits into 514 0 times, leaving a remainder of 514.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 514, we end up with 514.
Include the next digit (2) from the dividend after 514, then repeat: 5142 / 831

Going ahead to step 4:
5142 divided by 831 is 6 with a remainder of 156.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Deduct 4986 from 5142 and we're left with 156.
Bring next digit (1) of the dividend behind the 156 and repeat the process: 1561 / 831

Let's proceed to step 5:
If we divide 1561 by 831, we get 1 and a remainder of 730.
Write down 1 as next digit of the result. 
Result so far: 61.0
If we subtract 831 from 1561, we get 730.
Append the next digit (6) from the dividend to 730 and continue with: 7306 / 831

Advancing to step 6:
831 goes into 7306 8 times with a remainder of 658.
Write down 8 as next digit of the result. 
Result so far: 618.0
Subtract 6648 from 7306 to get 658.
Include the next digit (2) from the dividend after 658, then repeat: 6582 / 831

Advancing to step 7:
831 goes into 6582 7 times with a remainder of 765.
The next digit of our result is 7. 
Result so far: 6187.0
If we subtract 5817 from 6582, we get 765.
Append the next digit (0) from the dividend to 765 and continue with: 7650 / 831

Step 8:
831 goes into 7650 9 times with a remainder of 171.
Use 9 as the next digit of our solution. 
Result so far: 61879.0
The remainder is 171 after subtracting 7479 from 7650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Let's proceed to step 9:
831 goes into 1710 2 times with a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 61879.2
Deduct 1662 from 1710 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 10:
If we divide 480 by 831, we get 0 and a remainder of 480.
Put 0 as the next digit of the answer. 
Result so far: 61879.2
The remainder is 480 after subtracting 0 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 11:
4800 divided by 831 is 5 with a remainder of 645.
The number 5 becomes the next digit in our result. 
Result so far: 61879.205
Subtract 4155 from 4800 to get 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

Moving on to step 12:
If we divide 6450 by 831, we get 7 and a remainder of 633.
Write down 7 as next digit of the result. 
Result so far: 61879.2057
The remainder is 633 after subtracting 5817 from 6450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6330, and continue the process.

Going ahead to step 13:
831 goes into 6330 7 times with a remainder of 513.
The next digit of our result is 7. 
Result so far: 61879.20577
Subtracting 5817 from 6330 leaves us with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

In conclusion, the division gives 61879.20577 with a balance of 0.000513.