We divide 51709688 by 781
We want to figure out the number of times 51709688 can be divided by 781.

Moving on to step 1:
When dividing 5 by 781, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 781

On to step 2:
If we divide 51 by 781, we get 0 and a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Include the next digit (7) from the dividend after 51, then repeat: 517 / 781

On to step 3:
781 can be fit into 517 0 times, resulting in a remainder of 517.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 517 after subtracting 0 from 517.
Bring next digit (0) of the dividend behind the 517 and repeat the process: 5170 / 781

Let's proceed to step 4:
When dividing 5170 by 781, we get 6 with a remainder of 484.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 4686 from 5170 and we're left with 484.
Fetch the next digit (9) from the dividend, attach it to 484 and continue: 4849 / 781

Going ahead to step 5:
4849 divided by 781 is 6 with a remainder of 163.
The next digit of our result is 6. 
Result so far: 66.0
Subtracting 4686 from 4849 leaves us with 163.
Include the next digit (6) from the dividend after 163, then repeat: 1636 / 781

Moving on to step 6:
When dividing 1636 by 781, we get 2 with a remainder of 74.
Record the quotient 2 as the next digit in the result. 
Result so far: 662.0
Deduct 1562 from 1636 and we're left with 74.
Include the next digit (8) from the dividend after 74, then repeat: 748 / 781

Going ahead to step 7:
When dividing 748 by 781, we get 0 with a remainder of 748.
The next digit of our result is 0. 
Result so far: 6620.0
Deduct 0 from 748 and we're left with 748.
Grab the next digit (8) from the dividend, add it to 748, then carry on: 7488 / 781

Step 8:
781 can be fit into 7488 9 times, resulting in a remainder of 459.
Put 9 as the next digit of the answer. 
Result so far: 66209.0
Deduct 7029 from 7488 and we're left with 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4590, and continue the process.

Let's proceed to step 9:
781 can be fit into 4590 5 times, resulting in a remainder of 685.
The number 5 becomes the next digit in our result. 
Result so far: 66209.5
If we subtract 3905 from 4590, we get 685.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6850, and continue the process.

Step 10:
The number 781 fits into 6850 8 times, leaving a remainder of 602.
Write down 8 as next digit of the result. 
Result so far: 66209.58
Subtracting 6248 from 6850 leaves us with 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

Going ahead to step 11:
781 can be fit into 6020 7 times, resulting in a remainder of 553.
The number 7 becomes the next digit in our result. 
Result so far: 66209.587
Subtracting 5467 from 6020 leaves us with 553.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5530, and continue the process.

Let's proceed to step 12:
5530 divided by 781 is 7 with a remainder of 63.
The next digit of our result is 7. 
Result so far: 66209.5877
Subtract 5467 from 5530 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

After the division, we end up with 66209.5877 and a remainder of 0.00063.