We're dividing 102138 by 12 
Our goal is to divide 102138 by 12.

Step 1:
1 divided by 12 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 12

Moving on to step 2:
12 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (2) from the dividend, add it to 10, then carry on: 102 / 12

Let's proceed to step 3:
When dividing 102 by 12, we get 8 with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 96 from 102, we get 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 12

Advancing to step 4:
12 can be fit into 61 5 times, resulting in a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
If we subtract 60 from 61, we get 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 12

Going ahead to step 5:
12 can be fit into 13 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 851.0
If we subtract 12 from 13, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 12

Step 6:
The number 12 fits into 18 1 times, leaving a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 8511.0
If we take 12 away from 18, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 8511.5
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8511.5
If we take 0 away from 0, we end up 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.

Let's proceed to step 9:
The number 12 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8511.5
If we take 0 away from 0, we end up 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.

In conclusion, the division gives 8511.5 with a balance of 0.0.