129687 ÷ 51 
We want to divide 129687 by 51.

Step 1:
51 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 51

Advancing to step 2:
When dividing 12 by 51, we get 0 with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 51

Let's proceed to step 3:
When dividing 129 by 51, we get 2 with a remainder of 27.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 102 from 129 leaves us with 27.
Append the next digit (6) from the dividend to 27 and continue with: 276 / 51

Step 4:
276 divided by 51 is 5 with a remainder of 21.
Use 5 as the next digit of our solution. 
Result so far: 25.0
Subtracting 255 from 276 leaves us with 21.
Include the next digit (8) from the dividend after 21, then repeat: 218 / 51

Let's proceed to step 5:
When dividing 218 by 51, we get 4 with a remainder of 14.
The next digit of our result is 4. 
Result so far: 254.0
If we take 204 away from 218, we end up with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 51

Step 6:
If we divide 147 by 51, we get 2 and a remainder of 45.
Put 2 as the next digit of the answer. 
Result so far: 2542.0
If we take 102 away from 147, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 7:
The number 51 fits into 450 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 2542.8
The remainder is 42 after subtracting 408 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 8:
The number 51 fits into 420 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 2542.88
Subtracting 408 from 420 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 2542.88 with a remaining 0.012.