51365794 ÷ 643 
We want to divide 51365794 by 643.

Advancing to step 1:
If we divide 5 by 643, we get 0 and 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.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 643

Going ahead to step 2:
When dividing 51 by 643, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Include the next digit (3) from the dividend after 51, then repeat: 513 / 643

Advancing to step 3:
If we divide 513 by 643, we get 0 and a remainder of 513.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 513 and we're left with 513.
Take the next digit (6) from the dividend and append it to 513, then repeat: 5136 / 643

Step 4:
5136 divided by 643 is 7 with a remainder of 635.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 4501 away from 5136, we end up with 635.
Grab the next digit (5) from the dividend, add it to 635, then carry on: 6355 / 643

Step 5:
If we divide 6355 by 643, we get 9 and a remainder of 568.
Use 9 as the next digit of our solution. 
Result so far: 79.0
Subtracting 5787 from 6355 leaves us with 568.
Include the next digit (7) from the dividend after 568, then repeat: 5687 / 643

Advancing to step 6:
5687 divided by 643 is 8 with a remainder of 543.
Use 8 as the next digit of our solution. 
Result so far: 798.0
Subtracting 5144 from 5687 leaves us with 543.
Append the next digit (9) from the dividend to 543 and continue with: 5439 / 643

Let's proceed to step 7:
When dividing 5439 by 643, we get 8 with a remainder of 295.
Write down 8 as next digit of the result. 
Result so far: 7988.0
Subtract 5144 from 5439 to get 295.
Fetch the next digit (4) from the dividend, attach it to 295 and continue: 2954 / 643

Let's proceed to step 8:
2954 divided by 643 is 4 with a remainder of 382.
Use 4 as the next digit of our solution. 
Result so far: 79884.0
Deduct 2572 from 2954 and we're left with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Going ahead to step 9:
3820 divided by 643 is 5 with a remainder of 605.
The number 5 becomes the next digit in our result. 
Result so far: 79884.5
The remainder is 605 after subtracting 3215 from 3820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

On to step 10:
643 can be fit into 6050 9 times, resulting in a remainder of 263.
Write down 9 as next digit of the result. 
Result so far: 79884.59
Subtract 5787 from 6050 to get 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Moving on to step 11:
2630 divided by 643 is 4 with a remainder of 58.
Write down 4 as next digit of the result. 
Result so far: 79884.594
The remainder is 58 after subtracting 2572 from 2630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 12:
643 goes into 580 0 times with a remainder of 580.
The number 0 becomes the next digit in our result. 
Result so far: 79884.594
If we subtract 0 from 580, we get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 13:
643 can be fit into 5800 9 times, resulting in a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 79884.59409
The remainder is 13 after subtracting 5787 from 5800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 14:
130 divided by 643 is 0 with a remainder of 130.
Put 0 as the next digit of the answer. 
Result so far: 79884.59409
If we take 0 away from 130, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 15:
When dividing 1300 by 643, we get 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 79884.5940902
The remainder is 14 after subtracting 1286 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 16:
When dividing 140 by 643, we get 0 with a remainder of 140.
Use 0 as the next digit of our solution. 
Result so far: 79884.5940902
Subtracting 0 from 140 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Our division results in 79884.5940902 with a remaining 1.4e-07.