We look at the division of 51395933 by 686 
We're looking to find how many times 686 goes into 51395933.

On to step 1:
When dividing 5 by 686, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 686

Advancing to step 2:
51 divided by 686 is 0 with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Include the next digit (3) from the dividend after 51, then repeat: 513 / 686

Moving on to step 3:
513 divided by 686 is 0 with a remainder of 513.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 513 leaves us with 513.
Include the next digit (9) from the dividend after 513, then repeat: 5139 / 686

Advancing to step 4:
The number 686 fits into 5139 7 times, leaving a remainder of 337.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 337 after subtracting 4802 from 5139.
Fetch the next digit (5) from the dividend, attach it to 337 and continue: 3375 / 686

Let's proceed to step 5:
If we divide 3375 by 686, we get 4 and a remainder of 631.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
The remainder is 631 after subtracting 2744 from 3375.
Include the next digit (9) from the dividend after 631, then repeat: 6319 / 686

Step 6:
When dividing 6319 by 686, we get 9 with a remainder of 145.
Put 9 as the next digit of the answer. 
Result so far: 749.0
If we take 6174 away from 6319, we end up with 145.
Fetch the next digit (3) from the dividend, attach it to 145 and continue: 1453 / 686

On to step 7:
The number 686 fits into 1453 2 times, leaving a remainder of 81.
Write down 2 as next digit of the result. 
Result so far: 7492.0
If we subtract 1372 from 1453, we get 81.
Include the next digit (3) from the dividend after 81, then repeat: 813 / 686

Step 8:
686 can be fit into 813 1 times, resulting in a remainder of 127.
Write down 1 as next digit of the result. 
Result so far: 74921.0
Deduct 686 from 813 and we're left with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 9:
1270 divided by 686 is 1 with a remainder of 584.
Put 1 as the next digit of the answer. 
Result so far: 74921.1
Subtracting 686 from 1270 leaves us with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

Advancing to step 10:
If we divide 5840 by 686, we get 8 and a remainder of 352.
Write down 8 as next digit of the result. 
Result so far: 74921.18
If we take 5488 away from 5840, we end up with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Moving on to step 11:
686 goes into 3520 5 times with a remainder of 90.
Put 5 as the next digit of the answer. 
Result so far: 74921.185
Deduct 3430 from 3520 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.

Moving on to step 12:
When dividing 900 by 686, we get 1 with a remainder of 214.
Put 1 as the next digit of the answer. 
Result so far: 74921.1851
If we take 686 away from 900, we end up with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Going ahead to step 13:
2140 divided by 686 is 3 with a remainder of 82.
The number 3 becomes the next digit in our result. 
Result so far: 74921.18513
The remainder is 82 after subtracting 2058 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 14:
820 divided by 686 is 1 with a remainder of 134.
The number 1 becomes the next digit in our result. 
Result so far: 74921.185131
Subtracting 686 from 820 leaves us with 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Advancing to step 15:
The number 686 fits into 1340 1 times, leaving a remainder of 654.
The number 1 becomes the next digit in our result. 
Result so far: 74921.1851311
The remainder is 654 after subtracting 686 from 1340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

After the division, we end up with 74921.1851311 and a remainder of 6.54e-06.