We divide 77088664 by 399
Let's see how many times 399 fits into 77088664.

Step 1:
399 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 399

Going ahead to step 2:
When dividing 77 by 399, we get 0 with a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 77 leaves us with 77.
Fetch the next digit (0) from the dividend, attach it to 77 and continue: 770 / 399

On to step 3:
399 goes into 770 1 times with a remainder of 371.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 399 from 770 and we're left with 371.
Bring next digit (8) of the dividend behind the 371 and repeat the process: 3718 / 399

Moving on to step 4:
When dividing 3718 by 399, we get 9 with a remainder of 127.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we take 3591 away from 3718, we end up with 127.
Append the next digit (8) from the dividend to 127 and continue with: 1278 / 399

Advancing to step 5:
When dividing 1278 by 399, we get 3 with a remainder of 81.
The number 3 becomes the next digit in our result. 
Result so far: 193.0
If we subtract 1197 from 1278, we get 81.
Grab the next digit (6) from the dividend, add it to 81, then carry on: 816 / 399

Step 6:
The number 399 fits into 816 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 1932.0
Subtracting 798 from 816 leaves us with 18.
Bring next digit (6) of the dividend behind the 18 and repeat the process: 186 / 399

Step 7:
If we divide 186 by 399, we get 0 and a remainder of 186.
Use 0 as the next digit of our solution. 
Result so far: 19320.0
Subtracting 0 from 186 leaves us with 186.
Append the next digit (4) from the dividend to 186 and continue with: 1864 / 399

On to step 8:
399 can be fit into 1864 4 times, resulting in a remainder of 268.
Write down 4 as next digit of the result. 
Result so far: 193204.0
If we subtract 1596 from 1864, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 9:
399 goes into 2680 6 times with a remainder of 286.
Put 6 as the next digit of the answer. 
Result so far: 193204.6
The remainder is 286 after subtracting 2394 from 2680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

On to step 10:
399 goes into 2860 7 times with a remainder of 67.
Use 7 as the next digit of our solution. 
Result so far: 193204.67
If we take 2793 away from 2860, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 11:
670 divided by 399 is 1 with a remainder of 271.
The next digit of our result is 1. 
Result so far: 193204.671
If we take 399 away from 670, we end up with 271.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Moving on to step 12:
When dividing 2710 by 399, we get 6 with a remainder of 316.
The number 6 becomes the next digit in our result. 
Result so far: 193204.6716
The remainder is 316 after subtracting 2394 from 2710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 13:
The number 399 fits into 3160 7 times, leaving a remainder of 367.
Record the quotient 7 as the next digit in the result. 
Result so far: 193204.67167
If we take 2793 away from 3160, we end up with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Step 14:
If we divide 3670 by 399, we get 9 and a remainder of 79.
The next digit of our result is 9. 
Result so far: 193204.671679
If we subtract 3591 from 3670, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 15:
790 divided by 399 is 1 with a remainder of 391.
Record the quotient 1 as the next digit in the result. 
Result so far: 193204.6716791
If we take 399 away from 790, we end up with 391.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

Let's proceed to step 16:
399 can be fit into 3910 9 times, resulting in a remainder of 319.
The number 9 becomes the next digit in our result. 
Result so far: 193204.67167919
If we subtract 3591 from 3910, we get 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

The final outcome is 193204.67167919, with a leftover of 3.19e-07.