70104159 ÷ 686 
Our goal is to divide 70104159 by 686.

Moving on to step 1:
686 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 686

On to step 2:
686 can be fit into 70 0 times, resulting in a remainder of 70.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 70 and we're left with 70.
Grab the next digit (1) from the dividend, add it to 70, then carry on: 701 / 686

Going ahead to step 3:
If we divide 701 by 686, we get 1 and a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 686 from 701 to get 15.
Include the next digit (0) from the dividend after 15, then repeat: 150 / 686

Moving on to step 4:
If we divide 150 by 686, we get 0 and a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 150 leaves us with 150.
Append the next digit (4) from the dividend to 150 and continue with: 1504 / 686

Advancing to step 5:
1504 divided by 686 is 2 with a remainder of 132.
Use 2 as the next digit of our solution. 
Result so far: 102.0
If we take 1372 away from 1504, we end up with 132.
Bring next digit (1) of the dividend behind the 132 and repeat the process: 1321 / 686

On to step 6:
The number 686 fits into 1321 1 times, leaving a remainder of 635.
Use 1 as the next digit of our solution. 
Result so far: 1021.0
If we subtract 686 from 1321, we get 635.
Append the next digit (5) from the dividend to 635 and continue with: 6355 / 686

Going ahead to step 7:
When dividing 6355 by 686, we get 9 with a remainder of 181.
Put 9 as the next digit of the answer. 
Result so far: 10219.0
Subtract 6174 from 6355 to get 181.
Grab the next digit (9) from the dividend, add it to 181, then carry on: 1819 / 686

Moving on to step 8:
When dividing 1819 by 686, we get 2 with a remainder of 447.
Write down 2 as next digit of the result. 
Result so far: 102192.0
If we subtract 1372 from 1819, we get 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4470, and continue the process.

On to step 9:
If we divide 4470 by 686, we get 6 and a remainder of 354.
Use 6 as the next digit of our solution. 
Result so far: 102192.6
Subtracting 4116 from 4470 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

On to step 10:
When dividing 3540 by 686, we get 5 with a remainder of 110.
Write down 5 as next digit of the result. 
Result so far: 102192.65
Subtract 3430 from 3540 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 11:
1100 divided by 686 is 1 with a remainder of 414.
The number 1 becomes the next digit in our result. 
Result so far: 102192.651
If we subtract 686 from 1100, we get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

Advancing to step 12:
If we divide 4140 by 686, we get 6 and a remainder of 24.
The next digit of our result is 6. 
Result so far: 102192.6516
Subtracting 4116 from 4140 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 13:
The number 686 fits into 240 0 times, leaving a remainder of 240.
Use 0 as the next digit of our solution. 
Result so far: 102192.6516
If we subtract 0 from 240, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 14:
2400 divided by 686 is 3 with a remainder of 342.
The next digit of our result is 3. 
Result so far: 102192.651603
Subtracting 2058 from 2400 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

On to step 15:
686 goes into 3420 4 times with a remainder of 676.
Put 4 as the next digit of the answer. 
Result so far: 102192.6516034
Deduct 2744 from 3420 and we're left with 676.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6760, and continue the process.

Step 16:
6760 divided by 686 is 9 with a remainder of 586.
Use 9 as the next digit of our solution. 
Result so far: 102192.65160349
If we take 6174 away from 6760, we end up with 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

After the division, we end up with 102192.65160349 and a remainder of 5.86e-07.