We're dividing 186123 by 18 
We want to figure out the number of times 186123 can be divided by 18.

Step 1:
If we divide 1 by 18, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 18

On to step 2:
When dividing 18 by 18, we get 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 18 from 18 to get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 18

Step 3:
The number 18 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 18

Step 4:
If we divide 61 by 18, we get 3 and a remainder of 7.
The next digit of our result is 3. 
Result so far: 103.0
If we take 54 away from 61, we end up with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 18

Going ahead to step 5:
18 can be fit into 72 4 times, resulting in a remainder of 0.
The next digit of our result is 4. 
Result so far: 1034.0
If we subtract 72 from 72, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 18

Step 6:
The number 18 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 10340.0
The remainder is 3 after subtracting 0 from 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
The number 18 fits into 30 1 times, leaving a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 10340.1
If we subtract 18 from 30, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
If we divide 120 by 18, we get 6 and a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 10340.16
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
When dividing 120 by 18, we get 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 10340.166
If we take 108 away from 120, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 10340.166, and the remainder is 0.0012.