We're dividing 8390181 by 680 
We want to figure out the number of times 8390181 can be divided by 680.

On to step 1:
680 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 680

On to step 2:
680 can be fit into 83 0 times, resulting in a remainder of 83.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Bring next digit (9) of the dividend behind the 83 and repeat the process: 839 / 680

Let's proceed to step 3:
680 goes into 839 1 times with a remainder of 159.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 680 from 839, we get 159.
Grab the next digit (0) from the dividend, add it to 159, then carry on: 1590 / 680

Let's proceed to step 4:
The number 680 fits into 1590 2 times, leaving a remainder of 230.
The next digit of our result is 2. 
Result so far: 12.0
Subtract 1360 from 1590 to get 230.
Take the next digit (1) from the dividend and append it to 230, then repeat: 2301 / 680

Moving on to step 5:
680 goes into 2301 3 times with a remainder of 261.
Use 3 as the next digit of our solution. 
Result so far: 123.0
The remainder is 261 after subtracting 2040 from 2301.
Bring next digit (8) of the dividend behind the 261 and repeat the process: 2618 / 680

Going ahead to step 6:
680 goes into 2618 3 times with a remainder of 578.
Use 3 as the next digit of our solution. 
Result so far: 1233.0
Subtract 2040 from 2618 to get 578.
Grab the next digit (1) from the dividend, add it to 578, then carry on: 5781 / 680

Moving on to step 7:
The number 680 fits into 5781 8 times, leaving a remainder of 341.
Put 8 as the next digit of the answer. 
Result so far: 12338.0
If we take 5440 away from 5781, we end up with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

On to step 8:
680 goes into 3410 5 times with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 12338.5
If we subtract 3400 from 3410, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
680 can be fit into 100 0 times, resulting in a remainder of 100.
Put 0 as the next digit of the answer. 
Result so far: 12338.5
If we take 0 away from 100, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 10:
When dividing 1000 by 680, we get 1 with a remainder of 320.
Use 1 as the next digit of our solution. 
Result so far: 12338.501
Deduct 680 from 1000 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 11:
680 goes into 3200 4 times with a remainder of 480.
The number 4 becomes the next digit in our result. 
Result so far: 12338.5014
Deduct 2720 from 3200 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 12:
If we divide 4800 by 680, we get 7 and a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 12338.50147
The remainder is 40 after subtracting 4760 from 4800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 13:
When dividing 400 by 680, we get 0 with a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 12338.50147
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 14:
4000 divided by 680 is 5 with a remainder of 600.
The next digit of our result is 5. 
Result so far: 12338.5014705
Deduct 3400 from 4000 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Moving on to step 15:
If we divide 6000 by 680, we get 8 and a remainder of 560.
The number 8 becomes the next digit in our result. 
Result so far: 12338.50147058
The remainder is 560 after subtracting 5440 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

The final outcome is 12338.50147058, with a leftover of 5.6e-07.