803644 divided by 51 
We're looking to find how many times 51 goes into 803644.

Step 1:
When dividing 8 by 51, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 51

Moving on to step 2:
If we divide 80 by 51, we get 1 and a remainder of 29.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 51 from 80 leaves us with 29.
Fetch the next digit (3) from the dividend, attach it to 29 and continue: 293 / 51

Step 3:
When dividing 293 by 51, we get 5 with a remainder of 38.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we take 255 away from 293, we end up with 38.
Include the next digit (6) from the dividend after 38, then repeat: 386 / 51

Moving on to step 4:
51 can be fit into 386 7 times, resulting in a remainder of 29.
Use 7 as the next digit of our solution. 
Result so far: 157.0
If we take 357 away from 386, we end up with 29.
Fetch the next digit (4) from the dividend, attach it to 29 and continue: 294 / 51

Moving on to step 5:
51 goes into 294 5 times with a remainder of 39.
The next digit of our result is 5. 
Result so far: 1575.0
If we subtract 255 from 294, we get 39.
Grab the next digit (4) from the dividend, add it to 39, then carry on: 394 / 51

Let's proceed to step 6:
If we divide 394 by 51, we get 7 and a remainder of 37.
Record the quotient 7 as the next digit in the result. 
Result so far: 15757.0
If we subtract 357 from 394, we get 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 7:
When dividing 370 by 51, we get 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 15757.7
The remainder is 13 after subtracting 357 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 8:
130 divided by 51 is 2 with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 15757.72
Subtracting 102 from 130 leaves us 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.

Advancing to step 9:
51 can be fit into 280 5 times, resulting in a remainder of 25.
The next digit of our result is 5. 
Result so far: 15757.725
The remainder is 25 after subtracting 255 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 10:
51 can be fit into 250 4 times, resulting in a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 15757.7254
If we take 204 away from 250, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 11:
The number 51 fits into 460 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 15757.72549
Deduct 459 from 460 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 12:
The number 51 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 15757.72549
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 13:
51 goes into 100 1 times with a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 15757.7254901
If we take 51 away from 100, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 14:
51 goes into 490 9 times with a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 15757.72549019
Deduct 459 from 490 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Our division results in 15757.72549019 with a remaining 3.1e-08.