51451803 ÷ 807 
Let's see how many times 807 fits into 51451803.

Advancing to step 1:
807 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
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 807

Let's proceed to step 2:
51 divided by 807 is 0 with a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Include the next digit (4) from the dividend after 51, then repeat: 514 / 807

Moving on to step 3:
514 divided by 807 is 0 with a remainder of 514.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 514 after subtracting 0 from 514.
Take the next digit (5) from the dividend and append it to 514, then repeat: 5145 / 807

Going ahead to step 4:
If we divide 5145 by 807, we get 6 and a remainder of 303.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 4842 from 5145, we get 303.
Bring next digit (1) of the dividend behind the 303 and repeat the process: 3031 / 807

Step 5:
3031 divided by 807 is 3 with a remainder of 610.
Record the quotient 3 as the next digit in the result. 
Result so far: 63.0
If we take 2421 away from 3031, we end up with 610.
Bring next digit (8) of the dividend behind the 610 and repeat the process: 6108 / 807

Moving on to step 6:
If we divide 6108 by 807, we get 7 and a remainder of 459.
The number 7 becomes the next digit in our result. 
Result so far: 637.0
Subtracting 5649 from 6108 leaves us with 459.
Fetch the next digit (0) from the dividend, attach it to 459 and continue: 4590 / 807

Let's proceed to step 7:
807 goes into 4590 5 times with a remainder of 555.
Put 5 as the next digit of the answer. 
Result so far: 6375.0
If we subtract 4035 from 4590, we get 555.
Take the next digit (3) from the dividend and append it to 555, then repeat: 5553 / 807

Step 8:
5553 divided by 807 is 6 with a remainder of 711.
Write down 6 as next digit of the result. 
Result so far: 63756.0
Subtract 4842 from 5553 to get 711.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7110, and continue the process.

Step 9:
7110 divided by 807 is 8 with a remainder of 654.
Record the quotient 8 as the next digit in the result. 
Result so far: 63756.8
Subtracting 6456 from 7110 leaves us with 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

Moving on to step 10:
The number 807 fits into 6540 8 times, leaving a remainder of 84.
Use 8 as the next digit of our solution. 
Result so far: 63756.88
Subtract 6456 from 6540 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Our division results in 63756.88 with a remaining 0.084.