Let's divide 51071235 by 686
We want to divide 51071235 by 686.

Step 1:
If we divide 5 by 686, we get 0 and 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.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 686

On to step 2:
The number 686 fits into 51 0 times, leaving a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Append the next digit (0) from the dividend to 51 and continue with: 510 / 686

Step 3:
686 goes into 510 0 times with a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 510 to get 510.
Fetch the next digit (7) from the dividend, attach it to 510 and continue: 5107 / 686

Going ahead to step 4:
686 goes into 5107 7 times with a remainder of 305.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 305 after subtracting 4802 from 5107.
Grab the next digit (1) from the dividend, add it to 305, then carry on: 3051 / 686

Moving on to step 5:
The number 686 fits into 3051 4 times, leaving a remainder of 307.
Use 4 as the next digit of our solution. 
Result so far: 74.0
The remainder is 307 after subtracting 2744 from 3051.
Take the next digit (2) from the dividend and append it to 307, then repeat: 3072 / 686

Let's proceed to step 6:
686 can be fit into 3072 4 times, resulting in a remainder of 328.
The next digit of our result is 4. 
Result so far: 744.0
If we subtract 2744 from 3072, we get 328.
Grab the next digit (3) from the dividend, add it to 328, then carry on: 3283 / 686

Moving on to step 7:
686 can be fit into 3283 4 times, resulting in a remainder of 539.
The number 4 becomes the next digit in our result. 
Result so far: 7444.0
Subtracting 2744 from 3283 leaves us with 539.
Append the next digit (5) from the dividend to 539 and continue with: 5395 / 686

Advancing to step 8:
When dividing 5395 by 686, we get 7 with a remainder of 593.
Put 7 as the next digit of the answer. 
Result so far: 74447.0
If we take 4802 away from 5395, we end up with 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

Step 9:
If we divide 5930 by 686, we get 8 and a remainder of 442.
The number 8 becomes the next digit in our result. 
Result so far: 74447.8
If we subtract 5488 from 5930, we get 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

On to step 10:
The number 686 fits into 4420 6 times, leaving a remainder of 304.
Put 6 as the next digit of the answer. 
Result so far: 74447.86
If we subtract 4116 from 4420, we get 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 11:
686 goes into 3040 4 times with a remainder of 296.
The next digit of our result is 4. 
Result so far: 74447.864
If we take 2744 away from 3040, we end up with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

On to step 12:
2960 divided by 686 is 4 with a remainder of 216.
Record the quotient 4 as the next digit in the result. 
Result so far: 74447.8644
If we take 2744 away from 2960, we end up with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

After the division, we end up with 74447.8644 and a remainder of 0.00216.