We're dividing 100139 by 87 
Let's see how many times 87 fits into 100139.

On to step 1:
When dividing 1 by 87, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 87

Let's proceed to step 2:
When dividing 10 by 87, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 87

Moving on to step 3:
If we divide 100 by 87, we get 1 and a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 87 from 100 to get 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 87

Going ahead to step 4:
When dividing 131 by 87, we get 1 with a remainder of 44.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtracting 87 from 131 leaves us with 44.
Include the next digit (3) from the dividend after 44, then repeat: 443 / 87

Let's proceed to step 5:
If we divide 443 by 87, we get 5 and a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 115.0
Subtracting 435 from 443 leaves us with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 87

On to step 6:
87 can be fit into 89 1 times, resulting in a remainder of 2.
The next digit of our result is 1. 
Result so far: 1151.0
If we take 87 away from 89, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
When dividing 20 by 87, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 1151.0
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
200 divided by 87 is 2 with a remainder of 26.
Write down 2 as next digit of the result. 
Result so far: 1151.02
If we subtract 174 from 200, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 9:
260 divided by 87 is 2 with a remainder of 86.
Use 2 as the next digit of our solution. 
Result so far: 1151.022
Subtract 174 from 260 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

In conclusion, the division gives 1151.022 with a balance of 0.0086.