51147574 divided by 129 
We want to divide 51147574 by 129.

On to step 1:
When dividing 5 by 129, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 129

On to step 2:
If we divide 51 by 129, we get 0 and a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Grab the next digit (1) from the dividend, add it to 51, then carry on: 511 / 129

On to step 3:
129 goes into 511 3 times with a remainder of 124.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 124 after subtracting 387 from 511.
Append the next digit (4) from the dividend to 124 and continue with: 1244 / 129

On to step 4:
129 goes into 1244 9 times with a remainder of 83.
Write down 9 as next digit of the result. 
Result so far: 39.0
Deduct 1161 from 1244 and we're left with 83.
Fetch the next digit (7) from the dividend, attach it to 83 and continue: 837 / 129

On to step 5:
The number 129 fits into 837 6 times, leaving a remainder of 63.
Put 6 as the next digit of the answer. 
Result so far: 396.0
If we subtract 774 from 837, we get 63.
Include the next digit (5) from the dividend after 63, then repeat: 635 / 129

Advancing to step 6:
129 goes into 635 4 times with a remainder of 119.
The number 4 becomes the next digit in our result. 
Result so far: 3964.0
Subtract 516 from 635 to get 119.
Grab the next digit (7) from the dividend, add it to 119, then carry on: 1197 / 129

Advancing to step 7:
1197 divided by 129 is 9 with a remainder of 36.
Use 9 as the next digit of our solution. 
Result so far: 39649.0
If we take 1161 away from 1197, we end up with 36.
Include the next digit (4) from the dividend after 36, then repeat: 364 / 129

Going ahead to step 8:
When dividing 364 by 129, we get 2 with a remainder of 106.
Record the quotient 2 as the next digit in the result. 
Result so far: 396492.0
If we take 258 away from 364, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

On to step 9:
If we divide 1060 by 129, we get 8 and a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 396492.8
The remainder is 28 after subtracting 1032 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 10:
The number 129 fits into 280 2 times, leaving a remainder of 22.
The next digit of our result is 2. 
Result so far: 396492.82
Subtract 258 from 280 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 11:
When dividing 220 by 129, we get 1 with a remainder of 91.
Write down 1 as next digit of the result. 
Result so far: 396492.821
The remainder is 91 after subtracting 129 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Advancing to step 12:
129 can be fit into 910 7 times, resulting in a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 396492.8217
Deduct 903 from 910 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 13:
If we divide 70 by 129, we get 0 and a remainder of 70.
The next digit of our result is 0. 
Result so far: 396492.8217
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 14:
When dividing 700 by 129, we get 5 with a remainder of 55.
The next digit of our result is 5. 
Result so far: 396492.821705
Subtracting 645 from 700 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 15:
129 can be fit into 550 4 times, resulting in a remainder of 34.
Put 4 as the next digit of the answer. 
Result so far: 396492.8217054
Subtracting 516 from 550 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 16:
129 can be fit into 340 2 times, resulting in a remainder of 82.
Write down 2 as next digit of the result. 
Result so far: 396492.82170542
Deduct 258 from 340 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

After the division, we end up with 396492.82170542 and a remainder of 8.2e-08.