We look at the division of 51129506 by 510 
We want to figure out the number of times 51129506 can be divided by 510.

Going ahead to step 1:
510 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 510

Step 2:
51 divided by 510 is 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Take the next digit (1) from the dividend and append it to 51, then repeat: 511 / 510

Let's proceed to step 3:
The number 510 fits into 511 1 times, leaving a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 510 from 511, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 510

Going ahead to step 4:
510 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 510

Going ahead to step 5:
129 divided by 510 is 0 with a remainder of 129.
The next digit of our result is 0. 
Result so far: 100.0
If we take 0 away from 129, we end up with 129.
Bring next digit (5) of the dividend behind the 129 and repeat the process: 1295 / 510

Step 6:
510 goes into 1295 2 times with a remainder of 275.
Record the quotient 2 as the next digit in the result. 
Result so far: 1002.0
The remainder is 275 after subtracting 1020 from 1295.
Include the next digit (0) from the dividend after 275, then repeat: 2750 / 510

Moving on to step 7:
The number 510 fits into 2750 5 times, leaving a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 10025.0
Subtract 2550 from 2750 to get 200.
Grab the next digit (6) from the dividend, add it to 200, then carry on: 2006 / 510

Advancing to step 8:
510 goes into 2006 3 times with a remainder of 476.
Record the quotient 3 as the next digit in the result. 
Result so far: 100253.0
Deduct 1530 from 2006 and we're left with 476.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

Going ahead to step 9:
4760 divided by 510 is 9 with a remainder of 170.
Put 9 as the next digit of the answer. 
Result so far: 100253.9
If we subtract 4590 from 4760, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Step 10:
If we divide 1700 by 510, we get 3 and a remainder of 170.
Put 3 as the next digit of the answer. 
Result so far: 100253.93
The remainder is 170 after subtracting 1530 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 11:
510 goes into 1700 3 times with a remainder of 170.
Write down 3 as next digit of the result. 
Result so far: 100253.933
Subtract 1530 from 1700 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final result is 100253.933 with a remainder of 0.017.