67680051 ÷ 399 
We want to divide 67680051 by 399.

Step 1:
If we divide 6 by 399, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 399

Advancing to step 2:
67 divided by 399 is 0 with a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 67 and we're left with 67.
Bring next digit (6) of the dividend behind the 67 and repeat the process: 676 / 399

Let's proceed to step 3:
If we divide 676 by 399, we get 1 and a remainder of 277.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 399 away from 676, we end up with 277.
Include the next digit (8) from the dividend after 277, then repeat: 2778 / 399

Let's proceed to step 4:
399 can be fit into 2778 6 times, resulting in a remainder of 384.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we subtract 2394 from 2778, we get 384.
Fetch the next digit (0) from the dividend, attach it to 384 and continue: 3840 / 399

Step 5:
When dividing 3840 by 399, we get 9 with a remainder of 249.
Record the quotient 9 as the next digit in the result. 
Result so far: 169.0
If we subtract 3591 from 3840, we get 249.
Bring next digit (0) of the dividend behind the 249 and repeat the process: 2490 / 399

Going ahead to step 6:
399 can be fit into 2490 6 times, resulting in a remainder of 96.
The number 6 becomes the next digit in our result. 
Result so far: 1696.0
Subtract 2394 from 2490 to get 96.
Append the next digit (5) from the dividend to 96 and continue with: 965 / 399

Advancing to step 7:
The number 399 fits into 965 2 times, leaving a remainder of 167.
Record the quotient 2 as the next digit in the result. 
Result so far: 16962.0
If we subtract 798 from 965, we get 167.
Grab the next digit (1) from the dividend, add it to 167, then carry on: 1671 / 399

Moving on to step 8:
The number 399 fits into 1671 4 times, leaving a remainder of 75.
Record the quotient 4 as the next digit in the result. 
Result so far: 169624.0
Subtract 1596 from 1671 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 9:
The number 399 fits into 750 1 times, leaving a remainder of 351.
Write down 1 as next digit of the result. 
Result so far: 169624.1
The remainder is 351 after subtracting 399 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

On to step 10:
399 goes into 3510 8 times with a remainder of 318.
Write down 8 as next digit of the result. 
Result so far: 169624.18
Subtract 3192 from 3510 to get 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

On to step 11:
The number 399 fits into 3180 7 times, leaving a remainder of 387.
The number 7 becomes the next digit in our result. 
Result so far: 169624.187
Subtracting 2793 from 3180 leaves us with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Going ahead to step 12:
When dividing 3870 by 399, we get 9 with a remainder of 279.
The next digit of our result is 9. 
Result so far: 169624.1879
Deduct 3591 from 3870 and we're left with 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Step 13:
399 goes into 2790 6 times with a remainder of 396.
The number 6 becomes the next digit in our result. 
Result so far: 169624.18796
If we take 2394 away from 2790, we end up with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Advancing to step 14:
When dividing 3960 by 399, we get 9 with a remainder of 369.
Put 9 as the next digit of the answer. 
Result so far: 169624.187969
If we take 3591 away from 3960, we end up with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Going ahead to step 15:
If we divide 3690 by 399, we get 9 and a remainder of 99.
Put 9 as the next digit of the answer. 
Result so far: 169624.1879699
Subtracting 3591 from 3690 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

The final outcome is 169624.1879699, with a leftover of 9.9e-07.