Let's divide 686813 by 51
We're looking to find how many times 51 goes into 686813.

Step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 51

Step 2:
51 can be fit into 68 1 times, resulting in a remainder of 17.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 51 from 68 leaves us with 17.
Grab the next digit (6) from the dividend, add it to 17, then carry on: 176 / 51

Step 3:
176 divided by 51 is 3 with a remainder of 23.
Use 3 as the next digit of our solution. 
Result so far: 13.0
The remainder is 23 after subtracting 153 from 176.
Fetch the next digit (8) from the dividend, attach it to 23 and continue: 238 / 51

On to step 4:
The number 51 fits into 238 4 times, leaving a remainder of 34.
The next digit of our result is 4. 
Result so far: 134.0
Deduct 204 from 238 and we're left with 34.
Take the next digit (1) from the dividend and append it to 34, then repeat: 341 / 51

Advancing to step 5:
341 divided by 51 is 6 with a remainder of 35.
Record the quotient 6 as the next digit in the result. 
Result so far: 1346.0
Subtracting 306 from 341 leaves us with 35.
Include the next digit (3) from the dividend after 35, then repeat: 353 / 51

Moving on to step 6:
51 can be fit into 353 6 times, resulting in a remainder of 47.
Use 6 as the next digit of our solution. 
Result so far: 13466.0
The remainder is 47 after subtracting 306 from 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 7:
51 goes into 470 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 13466.9
Subtracting 459 from 470 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 8:
When dividing 110 by 51, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 13466.92
Subtracting 102 from 110 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
If we divide 80 by 51, we get 1 and a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 13466.921
Subtract 51 from 80 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 10:
When dividing 290 by 51, we get 5 with a remainder of 35.
The next digit of our result is 5. 
Result so far: 13466.9215
Deduct 255 from 290 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 11:
If we divide 350 by 51, we get 6 and a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 13466.92156
The remainder is 44 after subtracting 306 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 12:
The number 51 fits into 440 8 times, leaving a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 13466.921568
Subtracting 408 from 440 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 13:
When dividing 320 by 51, we get 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 13466.9215686
Deduct 306 from 320 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 14:
140 divided by 51 is 2 with a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 13466.92156862
If we take 102 away from 140, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

The quotient of the division is 13466.92156862, and the remainder is 3.8e-08.