397980 divided by 51 
Our goal is to divide 397980 by 51.

Let's proceed to step 1:
The number 51 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 51

Advancing to step 2:
51 can be fit into 39 0 times, resulting in a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Fetch the next digit (7) from the dividend, attach it to 39 and continue: 397 / 51

Let's proceed to step 3:
51 can be fit into 397 7 times, resulting in a remainder of 40.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 357 from 397 and we're left with 40.
Include the next digit (9) from the dividend after 40, then repeat: 409 / 51

On to step 4:
The number 51 fits into 409 8 times, leaving a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
Deduct 408 from 409 and we're left with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 51

Let's proceed to step 5:
18 divided by 51 is 0 with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 780.0
If we subtract 0 from 18, we get 18.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 51

Going ahead to step 6:
51 can be fit into 180 3 times, resulting in a remainder of 27.
The next digit of our result is 3. 
Result so far: 7803.0
Subtract 153 from 180 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 7:
51 goes into 270 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 7803.5
Deduct 255 from 270 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 8:
When dividing 150 by 51, we get 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 7803.52
Subtract 102 from 150 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.

Moving on to step 9:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 7803.529
Deduct 459 from 480 and we're left 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.

Step 10:
If we divide 210 by 51, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 7803.5294
Subtract 204 from 210 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
51 can be fit into 60 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 7803.52941
Deduct 51 from 60 and we're left 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.

Step 12:
90 divided by 51 is 1 with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 7803.529411
Subtract 51 from 90 to get 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 final outcome is 7803.529411, with a leftover of 3.9e-06.