77847981 ÷ 399 
Our goal is to divide 77847981 by 399.

Let's proceed to step 1:
When dividing 7 by 399, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 399

Moving on to step 2:
When dividing 77 by 399, we get 0 with a remainder of 77.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 77 leaves us with 77.
Take the next digit (8) from the dividend and append it to 77, then repeat: 778 / 399

Going ahead to step 3:
399 goes into 778 1 times with a remainder of 379.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 399 from 778, we get 379.
Bring next digit (4) of the dividend behind the 379 and repeat the process: 3794 / 399

On to step 4:
When dividing 3794 by 399, we get 9 with a remainder of 203.
The next digit of our result is 9. 
Result so far: 19.0
If we subtract 3591 from 3794, we get 203.
Include the next digit (7) from the dividend after 203, then repeat: 2037 / 399

Let's proceed to step 5:
2037 divided by 399 is 5 with a remainder of 42.
Write down 5 as next digit of the result. 
Result so far: 195.0
The remainder is 42 after subtracting 1995 from 2037.
Bring next digit (9) of the dividend behind the 42 and repeat the process: 429 / 399

Let's proceed to step 6:
429 divided by 399 is 1 with a remainder of 30.
The next digit of our result is 1. 
Result so far: 1951.0
Subtract 399 from 429 to get 30.
Bring next digit (8) of the dividend behind the 30 and repeat the process: 308 / 399

Step 7:
The number 399 fits into 308 0 times, leaving a remainder of 308.
Write down 0 as next digit of the result. 
Result so far: 19510.0
Subtract 0 from 308 to get 308.
Bring next digit (1) of the dividend behind the 308 and repeat the process: 3081 / 399

Going ahead to step 8:
If we divide 3081 by 399, we get 7 and a remainder of 288.
The next digit of our result is 7. 
Result so far: 195107.0
If we subtract 2793 from 3081, we get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Step 9:
The number 399 fits into 2880 7 times, leaving a remainder of 87.
The number 7 becomes the next digit in our result. 
Result so far: 195107.7
Subtract 2793 from 2880 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Step 10:
If we divide 870 by 399, we get 2 and a remainder of 72.
Write down 2 as next digit of the result. 
Result so far: 195107.72
If we subtract 798 from 870, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 11:
399 goes into 720 1 times with a remainder of 321.
Write down 1 as next digit of the result. 
Result so far: 195107.721
Subtracting 399 from 720 leaves us with 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Step 12:
399 goes into 3210 8 times with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 195107.7218
Subtracting 3192 from 3210 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 13:
180 divided by 399 is 0 with a remainder of 180.
Record the quotient 0 as the next digit in the result. 
Result so far: 195107.7218
If we subtract 0 from 180, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Moving on to step 14:
1800 divided by 399 is 4 with a remainder of 204.
Use 4 as the next digit of our solution. 
Result so far: 195107.721804
The remainder is 204 after subtracting 1596 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

On to step 15:
If we divide 2040 by 399, we get 5 and a remainder of 45.
The next digit of our result is 5. 
Result so far: 195107.7218045
If we subtract 1995 from 2040, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 16:
If we divide 450 by 399, we get 1 and a remainder of 51.
Record the quotient 1 as the next digit in the result. 
Result so far: 195107.72180451
Subtract 399 from 450 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

In conclusion, the division gives 195107.72180451 with a balance of 5.1e-08.