80140907 ÷ 646 
We want to divide 80140907 by 646.

On to step 1:
When dividing 8 by 646, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 646

On to step 2:
646 can be fit into 80 0 times, resulting in a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Fetch the next digit (1) from the dividend, attach it to 80 and continue: 801 / 646

Advancing to step 3:
646 can be fit into 801 1 times, resulting in a remainder of 155.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 646 from 801, we get 155.
Fetch the next digit (4) from the dividend, attach it to 155 and continue: 1554 / 646

Advancing to step 4:
646 can be fit into 1554 2 times, resulting in a remainder of 262.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 1292 from 1554 to get 262.
Take the next digit (0) from the dividend and append it to 262, then repeat: 2620 / 646

Advancing to step 5:
When dividing 2620 by 646, we get 4 with a remainder of 36.
The next digit of our result is 4. 
Result so far: 124.0
If we take 2584 away from 2620, we end up with 36.
Grab the next digit (9) from the dividend, add it to 36, then carry on: 369 / 646

On to step 6:
369 divided by 646 is 0 with a remainder of 369.
Put 0 as the next digit of the answer. 
Result so far: 1240.0
If we take 0 away from 369, we end up with 369.
Bring next digit (0) of the dividend behind the 369 and repeat the process: 3690 / 646

Step 7:
If we divide 3690 by 646, we get 5 and a remainder of 460.
The next digit of our result is 5. 
Result so far: 12405.0
If we subtract 3230 from 3690, we get 460.
Grab the next digit (7) from the dividend, add it to 460, then carry on: 4607 / 646

Step 8:
When dividing 4607 by 646, we get 7 with a remainder of 85.
Record the quotient 7 as the next digit in the result. 
Result so far: 124057.0
Deduct 4522 from 4607 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 9:
The number 646 fits into 850 1 times, leaving a remainder of 204.
Put 1 as the next digit of the answer. 
Result so far: 124057.1
Subtracting 646 from 850 leaves us with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Advancing to step 10:
If we divide 2040 by 646, we get 3 and a remainder of 102.
Write down 3 as next digit of the result. 
Result so far: 124057.13
If we subtract 1938 from 2040, we get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Advancing to step 11:
The number 646 fits into 1020 1 times, leaving a remainder of 374.
Write down 1 as next digit of the result. 
Result so far: 124057.131
If we take 646 away from 1020, we end up with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Advancing to step 12:
646 can be fit into 3740 5 times, resulting in a remainder of 510.
Write down 5 as next digit of the result. 
Result so far: 124057.1315
Deduct 3230 from 3740 and we're left with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Advancing to step 13:
5100 divided by 646 is 7 with a remainder of 578.
Record the quotient 7 as the next digit in the result. 
Result so far: 124057.13157
If we take 4522 away from 5100, we end up with 578.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5780, and continue the process.

Let's proceed to step 14:
5780 divided by 646 is 8 with a remainder of 612.
Use 8 as the next digit of our solution. 
Result so far: 124057.131578
Subtract 5168 from 5780 to get 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Step 15:
646 can be fit into 6120 9 times, resulting in a remainder of 306.
Put 9 as the next digit of the answer. 
Result so far: 124057.1315789
The remainder is 306 after subtracting 5814 from 6120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Moving on to step 16:
The number 646 fits into 3060 4 times, leaving a remainder of 476.
Put 4 as the next digit of the answer. 
Result so far: 124057.13157894
The remainder is 476 after subtracting 2584 from 3060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

The final result is 124057.13157894 with a remainder of 4.76e-07.