51070861 divided by 129 
Let's see how many times 129 fits into 51070861.

On to step 1:
If we divide 5 by 129, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 129

Going ahead to step 2:
129 can be fit into 51 0 times, resulting in 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.
Append the next digit (0) from the dividend to 51 and continue with: 510 / 129

Step 3:
The number 129 fits into 510 3 times, leaving a remainder of 123.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 387 from 510 and we're left with 123.
Bring next digit (7) of the dividend behind the 123 and repeat the process: 1237 / 129

Let's proceed to step 4:
129 can be fit into 1237 9 times, resulting in a remainder of 76.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we take 1161 away from 1237, we end up with 76.
Take the next digit (0) from the dividend and append it to 76, then repeat: 760 / 129

Let's proceed to step 5:
760 divided by 129 is 5 with a remainder of 115.
The number 5 becomes the next digit in our result. 
Result so far: 395.0
If we take 645 away from 760, we end up with 115.
Bring next digit (8) of the dividend behind the 115 and repeat the process: 1158 / 129

Moving on to step 6:
129 goes into 1158 8 times with a remainder of 126.
Put 8 as the next digit of the answer. 
Result so far: 3958.0
Subtracting 1032 from 1158 leaves us with 126.
Take the next digit (6) from the dividend and append it to 126, then repeat: 1266 / 129

Step 7:
129 goes into 1266 9 times with a remainder of 105.
Write down 9 as next digit of the result. 
Result so far: 39589.0
If we subtract 1161 from 1266, we get 105.
Grab the next digit (1) from the dividend, add it to 105, then carry on: 1051 / 129

On to step 8:
The number 129 fits into 1051 8 times, leaving a remainder of 19.
The next digit of our result is 8. 
Result so far: 395898.0
If we subtract 1032 from 1051, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 9:
The number 129 fits into 190 1 times, leaving a remainder of 61.
Write down 1 as next digit of the result. 
Result so far: 395898.1
If we take 129 away from 190, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

On to step 10:
129 goes into 610 4 times with a remainder of 94.
The number 4 becomes the next digit in our result. 
Result so far: 395898.14
Deduct 516 from 610 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Moving on to step 11:
129 goes into 940 7 times with a remainder of 37.
Write down 7 as next digit of the result. 
Result so far: 395898.147
If we take 903 away from 940, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 12:
When dividing 370 by 129, we get 2 with a remainder of 112.
The next digit of our result is 2. 
Result so far: 395898.1472
If we subtract 258 from 370, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 13:
129 goes into 1120 8 times with a remainder of 88.
The number 8 becomes the next digit in our result. 
Result so far: 395898.14728
If we subtract 1032 from 1120, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 14:
880 divided by 129 is 6 with a remainder of 106.
Use 6 as the next digit of our solution. 
Result so far: 395898.147286
If we take 774 away from 880, 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.

Going ahead to step 15:
If we divide 1060 by 129, we get 8 and a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 395898.1472868
Deduct 1032 from 1060 and we're left with 28.
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 16:
If we divide 280 by 129, we get 2 and a remainder of 22.
Write down 2 as next digit of the result. 
Result so far: 395898.14728682
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.

After the division, we end up with 395898.14728682 and a remainder of 2.2e-08.