We divide 8139 by 85
We want to figure out the number of times 8139 can be divided by 85.

Moving on to step 1:
85 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 85

On to step 2:
When dividing 81 by 85, we get 0 with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Append the next digit (3) from the dividend to 81 and continue with: 813 / 85

Moving on to step 3:
When dividing 813 by 85, we get 9 with a remainder of 48.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 765 from 813, we get 48.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 85

Step 4:
489 divided by 85 is 5 with a remainder of 64.
Use 5 as the next digit of our solution. 
Result so far: 95.0
The remainder is 64 after subtracting 425 from 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 5:
85 can be fit into 640 7 times, resulting in a remainder of 45.
Record the quotient 7 as the next digit in the result. 
Result so far: 95.7
Deduct 595 from 640 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 6:
85 can be fit into 450 5 times, resulting in a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 95.75
The remainder is 25 after subtracting 425 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 7:
If we divide 250 by 85, we get 2 and a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 95.752
Subtract 170 from 250 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 8:
The number 85 fits into 800 9 times, leaving a remainder of 35.
Use 9 as the next digit of our solution. 
Result so far: 95.7529
Subtracting 765 from 800 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 9:
The number 85 fits into 350 4 times, leaving a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 95.75294
Deduct 340 from 350 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
The number 85 fits into 100 1 times, leaving a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 95.752941
If we subtract 85 from 100, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 11:
85 goes into 150 1 times with a remainder of 65.
The next digit of our result is 1. 
Result so far: 95.7529411
If we take 85 away from 150, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

After the division, we end up with 95.7529411 and a remainder of 6.5e-07.