51587879 ÷ 691 
Our goal is to divide 51587879 by 691.

Step 1:
691 can be fit into 5 0 times, resulting in 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.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 691

Moving on to step 2:
51 divided by 691 is 0 with a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Fetch the next digit (5) from the dividend, attach it to 51 and continue: 515 / 691

Moving on to step 3:
The number 691 fits into 515 0 times, leaving a remainder of 515.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 515, we end up with 515.
Fetch the next digit (8) from the dividend, attach it to 515 and continue: 5158 / 691

On to step 4:
When dividing 5158 by 691, we get 7 with a remainder of 321.
The next digit of our result is 7. 
Result so far: 7.0
If we take 4837 away from 5158, we end up with 321.
Take the next digit (7) from the dividend and append it to 321, then repeat: 3217 / 691

Step 5:
691 can be fit into 3217 4 times, resulting in a remainder of 453.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
The remainder is 453 after subtracting 2764 from 3217.
Grab the next digit (8) from the dividend, add it to 453, then carry on: 4538 / 691

Advancing to step 6:
When dividing 4538 by 691, we get 6 with a remainder of 392.
Write down 6 as next digit of the result. 
Result so far: 746.0
Subtract 4146 from 4538 to get 392.
Append the next digit (7) from the dividend to 392 and continue with: 3927 / 691

Advancing to step 7:
If we divide 3927 by 691, we get 5 and a remainder of 472.
The number 5 becomes the next digit in our result. 
Result so far: 7465.0
Deduct 3455 from 3927 and we're left with 472.
Grab the next digit (9) from the dividend, add it to 472, then carry on: 4729 / 691

Let's proceed to step 8:
If we divide 4729 by 691, we get 6 and a remainder of 583.
The next digit of our result is 6. 
Result so far: 74656.0
Deduct 4146 from 4729 and we're left with 583.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5830, and continue the process.

Let's proceed to step 9:
691 can be fit into 5830 8 times, resulting in a remainder of 302.
Write down 8 as next digit of the result. 
Result so far: 74656.8
Subtract 5528 from 5830 to get 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Moving on to step 10:
The number 691 fits into 3020 4 times, leaving a remainder of 256.
Record the quotient 4 as the next digit in the result. 
Result so far: 74656.84
Subtracting 2764 from 3020 leaves us with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

On to step 11:
The number 691 fits into 2560 3 times, leaving a remainder of 487.
The number 3 becomes the next digit in our result. 
Result so far: 74656.843
The remainder is 487 after subtracting 2073 from 2560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

Moving on to step 12:
691 can be fit into 4870 7 times, resulting in a remainder of 33.
Record the quotient 7 as the next digit in the result. 
Result so far: 74656.8437
If we subtract 4837 from 4870, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Advancing to step 13:
330 divided by 691 is 0 with a remainder of 330.
Put 0 as the next digit of the answer. 
Result so far: 74656.8437
Subtract 0 from 330 to get 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

On to step 14:
3300 divided by 691 is 4 with a remainder of 536.
The next digit of our result is 4. 
Result so far: 74656.843704
If we take 2764 away from 3300, we end up with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Moving on to step 15:
5360 divided by 691 is 7 with a remainder of 523.
The number 7 becomes the next digit in our result. 
Result so far: 74656.8437047
If we take 4837 away from 5360, we end up with 523.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5230, and continue the process.

Going ahead to step 16:
691 goes into 5230 7 times with a remainder of 393.
The number 7 becomes the next digit in our result. 
Result so far: 74656.84370477
If we take 4837 away from 5230, we end up with 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

The final result is 74656.84370477 with a remainder of 3.93e-07.