Let's divide 51373916 by 391
We're looking to find how many times 391 goes into 51373916.

On to step 1:
If we divide 5 by 391, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 391

Moving on to step 2:
When dividing 51 by 391, we get 0 with a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Take the next digit (3) from the dividend and append it to 51, then repeat: 513 / 391

Advancing to step 3:
The number 391 fits into 513 1 times, leaving a remainder of 122.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 391 from 513 to get 122.
Fetch the next digit (7) from the dividend, attach it to 122 and continue: 1227 / 391

Going ahead to step 4:
1227 divided by 391 is 3 with a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 13.0
If we take 1173 away from 1227, we end up with 54.
Include the next digit (3) from the dividend after 54, then repeat: 543 / 391

Going ahead to step 5:
The number 391 fits into 543 1 times, leaving a remainder of 152.
Write down 1 as next digit of the result. 
Result so far: 131.0
If we take 391 away from 543, we end up with 152.
Append the next digit (9) from the dividend to 152 and continue with: 1529 / 391

Advancing to step 6:
1529 divided by 391 is 3 with a remainder of 356.
Record the quotient 3 as the next digit in the result. 
Result so far: 1313.0
If we subtract 1173 from 1529, we get 356.
Include the next digit (1) from the dividend after 356, then repeat: 3561 / 391

On to step 7:
391 can be fit into 3561 9 times, resulting in a remainder of 42.
Record the quotient 9 as the next digit in the result. 
Result so far: 13139.0
Subtracting 3519 from 3561 leaves us with 42.
Append the next digit (6) from the dividend to 42 and continue with: 426 / 391

Step 8:
391 can be fit into 426 1 times, resulting in a remainder of 35.
Put 1 as the next digit of the answer. 
Result so far: 131391.0
If we subtract 391 from 426, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 9:
If we divide 350 by 391, we get 0 and a remainder of 350.
Record the quotient 0 as the next digit in the result. 
Result so far: 131391.0
Subtract 0 from 350 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 10:
The number 391 fits into 3500 8 times, leaving a remainder of 372.
Use 8 as the next digit of our solution. 
Result so far: 131391.08
Subtract 3128 from 3500 to get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Going ahead to step 11:
The number 391 fits into 3720 9 times, leaving a remainder of 201.
The number 9 becomes the next digit in our result. 
Result so far: 131391.089
Subtract 3519 from 3720 to get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

On to step 12:
2010 divided by 391 is 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 131391.0895
Subtracting 1955 from 2010 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 13:
If we divide 550 by 391, we get 1 and a remainder of 159.
The number 1 becomes the next digit in our result. 
Result so far: 131391.08951
Deduct 391 from 550 and we're left with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Moving on to step 14:
When dividing 1590 by 391, we get 4 with a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 131391.089514
Subtracting 1564 from 1590 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 15:
391 goes into 260 0 times with a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 131391.089514
If we take 0 away from 260, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 16:
The number 391 fits into 2600 6 times, leaving a remainder of 254.
The next digit of our result is 6. 
Result so far: 131391.08951406
Deduct 2346 from 2600 and we're left with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

After the division, we end up with 131391.08951406 and a remainder of 2.54e-07.