We look at the division of 166415 by 12 
We're looking to find how many times 12 goes into 166415.

Going ahead to step 1:
If we divide 1 by 12, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 12

Moving on to step 2:
12 can be fit into 16 1 times, resulting in a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 12 away from 16, we end up with 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 12

Let's proceed to step 3:
12 can be fit into 46 3 times, resulting in a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
If we subtract 36 from 46, we get 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 12

Moving on to step 4:
If we divide 104 by 12, we get 8 and a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 138.0
Subtract 96 from 104 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 12

Step 5:
12 can be fit into 81 6 times, resulting in a remainder of 9.
The next digit of our result is 6. 
Result so far: 1386.0
Subtracting 72 from 81 leaves us with 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 12

Going ahead to step 6:
12 goes into 95 7 times with a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 13867.0
Deduct 84 from 95 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
If we divide 110 by 12, we get 9 and a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 13867.9
Subtract 108 from 110 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
20 divided by 12 is 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 13867.91
If we take 12 away from 20, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
If we divide 80 by 12, we get 6 and a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 13867.916
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
80 divided by 12 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 13867.9166
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 13867.9166 with a remaining 8e-05.