We divide 286139 by 80
We want to figure out the number of times 286139 can be divided by 80.

On to step 1:
80 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 80

Let's proceed to step 2:
80 can be fit into 28 0 times, resulting in a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 28 after subtracting 0 from 28.
Take the next digit (6) from the dividend and append it to 28, then repeat: 286 / 80

Going ahead to step 3:
If we divide 286 by 80, we get 3 and a remainder of 46.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 240 away from 286, we end up with 46.
Bring next digit (1) of the dividend behind the 46 and repeat the process: 461 / 80

Advancing to step 4:
80 goes into 461 5 times with a remainder of 61.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
Subtracting 400 from 461 leaves us with 61.
Fetch the next digit (3) from the dividend, attach it to 61 and continue: 613 / 80

Moving on to step 5:
If we divide 613 by 80, we get 7 and a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 357.0
Subtracting 560 from 613 leaves us with 53.
Include the next digit (9) from the dividend after 53, then repeat: 539 / 80

Advancing to step 6:
80 goes into 539 6 times with a remainder of 59.
Write down 6 as next digit of the result. 
Result so far: 3576.0
Deduct 480 from 539 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Going ahead to step 7:
80 goes into 590 7 times with a remainder of 30.
Write down 7 as next digit of the result. 
Result so far: 3576.7
If we take 560 away from 590, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
When dividing 300 by 80, we get 3 with a remainder of 60.
Put 3 as the next digit of the answer. 
Result so far: 3576.73
The remainder is 60 after subtracting 240 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 3576.737
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
80 goes into 400 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 3576.7375
Subtracting 400 from 400 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3576.7375
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
0 divided by 80 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3576.7375
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3576.7375 and a remainder of 0.0.