809878 ÷ 51 
We're looking to find how many times 51 goes into 809878.

Advancing to step 1:
51 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 51

Step 2:
51 can be fit into 80 1 times, resulting in a remainder of 29.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 51 from 80 and we're left with 29.
Grab the next digit (9) from the dividend, add it to 29, then carry on: 299 / 51

On to step 3:
The number 51 fits into 299 5 times, leaving a remainder of 44.
The next digit of our result is 5. 
Result so far: 15.0
If we take 255 away from 299, we end up with 44.
Bring next digit (8) of the dividend behind the 44 and repeat the process: 448 / 51

Moving on to step 4:
If we divide 448 by 51, we get 8 and a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 158.0
If we take 408 away from 448, we end up with 40.
Append the next digit (7) from the dividend to 40 and continue with: 407 / 51

Advancing to step 5:
51 goes into 407 7 times with a remainder of 50.
Put 7 as the next digit of the answer. 
Result so far: 1587.0
If we take 357 away from 407, we end up with 50.
Grab the next digit (8) from the dividend, add it to 50, then carry on: 508 / 51

Moving on to step 6:
51 goes into 508 9 times with a remainder of 49.
The number 9 becomes the next digit in our result. 
Result so far: 15879.0
The remainder is 49 after subtracting 459 from 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 7:
51 can be fit into 490 9 times, resulting in a remainder of 31.
The next digit of our result is 9. 
Result so far: 15879.9
If we subtract 459 from 490, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 8:
51 goes into 310 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 15879.96
The remainder is 4 after subtracting 306 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
When dividing 40 by 51, we get 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 15879.96
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
If we divide 400 by 51, we get 7 and a remainder of 43.
The next digit of our result is 7. 
Result so far: 15879.9607
If we take 357 away from 400, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 11:
51 goes into 430 8 times with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 15879.96078
Subtract 408 from 430 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 12:
51 goes into 220 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 15879.960784
Subtract 204 from 220 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
51 goes into 160 3 times with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 15879.9607843
If we subtract 153 from 160, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 14:
The number 51 fits into 70 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 15879.96078431
The remainder is 19 after subtracting 51 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The quotient of the division is 15879.96078431, and the remainder is 1.9e-08.