140139 ÷ 87 
We want to divide 140139 by 87.

On to step 1:
The number 87 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 87

Moving on to step 2:
If we divide 14 by 87, we get 0 and a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 14 and we're left with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 87

On to step 3:
87 goes into 140 1 times with a remainder of 53.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 87 away from 140, we end up with 53.
Grab the next digit (1) from the dividend, add it to 53, then carry on: 531 / 87

On to step 4:
If we divide 531 by 87, we get 6 and a remainder of 9.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 522 from 531 to get 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 87

Advancing to step 5:
93 divided by 87 is 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 161.0
Subtract 87 from 93 to get 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 87

Going ahead to step 6:
If we divide 69 by 87, we get 0 and a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 1610.0
Subtract 0 from 69 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 7:
The number 87 fits into 690 7 times, leaving a remainder of 81.
The number 7 becomes the next digit in our result. 
Result so far: 1610.7
Subtracting 609 from 690 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Going ahead to step 8:
87 goes into 810 9 times with a remainder of 27.
Put 9 as the next digit of the answer. 
Result so far: 1610.79
Subtract 783 from 810 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 9:
If we divide 270 by 87, we get 3 and a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 1610.793
If we subtract 261 from 270, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 10:
When dividing 90 by 87, we get 1 with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1610.7931
Subtract 87 from 90 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
When dividing 30 by 87, we get 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 1610.7931
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 12:
87 goes into 300 3 times with a remainder of 39.
Record the quotient 3 as the next digit in the result. 
Result so far: 1610.793103
If we take 261 away from 300, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 13:
The number 87 fits into 390 4 times, leaving a remainder of 42.
The next digit of our result is 4. 
Result so far: 1610.7931034
If we take 348 away from 390, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 14:
420 divided by 87 is 4 with a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 1610.79310344
Subtract 348 from 420 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final outcome is 1610.79310344, with a leftover of 7.2e-08.