785142 divided by 51 
We want to figure out the number of times 785142 can be divided by 51.

Step 1:
51 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 51

On to step 2:
The number 51 fits into 78 1 times, leaving a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 51 from 78 to get 27.
Bring next digit (5) of the dividend behind the 27 and repeat the process: 275 / 51

Moving on to step 3:
51 can be fit into 275 5 times, resulting in a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
The remainder is 20 after subtracting 255 from 275.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 51

Let's proceed to step 4:
If we divide 201 by 51, we get 3 and a remainder of 48.
Use 3 as the next digit of our solution. 
Result so far: 153.0
If we subtract 153 from 201, we get 48.
Bring next digit (4) of the dividend behind the 48 and repeat the process: 484 / 51

Step 5:
The number 51 fits into 484 9 times, leaving a remainder of 25.
The next digit of our result is 9. 
Result so far: 1539.0
Subtract 459 from 484 to get 25.
Grab the next digit (2) from the dividend, add it to 25, then carry on: 252 / 51

Step 6:
The number 51 fits into 252 4 times, leaving a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 15394.0
Subtract 204 from 252 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 7:
When dividing 480 by 51, we get 9 with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 15394.9
If we take 459 away from 480, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 8:
When dividing 210 by 51, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 15394.94
Deduct 204 from 210 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
51 can be fit into 60 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 15394.941
If we take 51 away from 60, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 10:
51 goes into 90 1 times with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 15394.9411
Subtracting 51 from 90 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The quotient of the division is 15394.9411, and the remainder is 0.00039.