126513 divided by 51 
Let's see how many times 51 fits into 126513.

Moving on to step 1:
1 divided by 51 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 51

Let's proceed to step 2:
51 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 51

Step 3:
126 divided by 51 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 102 away from 126, we end up with 24.
Grab the next digit (5) from the dividend, add it to 24, then carry on: 245 / 51

On to step 4:
51 goes into 245 4 times with a remainder of 41.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we take 204 away from 245, we end up with 41.
Bring next digit (1) of the dividend behind the 41 and repeat the process: 411 / 51

Step 5:
If we divide 411 by 51, we get 8 and a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 248.0
The remainder is 3 after subtracting 408 from 411.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 51

On to step 6:
51 can be fit into 33 0 times, resulting in a remainder of 33.
Put 0 as the next digit of the answer. 
Result so far: 2480.0
If we take 0 away from 33, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 7:
If we divide 330 by 51, we get 6 and a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 2480.6
The remainder is 24 after subtracting 306 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 8:
If we divide 240 by 51, we get 4 and a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 2480.64
The remainder is 36 after subtracting 204 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 9:
If we divide 360 by 51, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 2480.647
Subtract 357 from 360 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
When dividing 30 by 51, we get 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 2480.647
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
300 divided by 51 is 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 2480.64705
If we subtract 255 from 300, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 12:
If we divide 450 by 51, we get 8 and a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 2480.647058
Subtracting 408 from 450 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 13:
51 can be fit into 420 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 2480.6470588
If we subtract 408 from 420, we get 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 2480.6470588 with a remaining 1.2e-07.