We're dividing 187491 by 12 
We want to figure out the number of times 187491 can be divided by 12.

Step 1:
When dividing 1 by 12, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 12

On to step 2:
12 goes into 18 1 times with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 12 from 18, we get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 12

Going ahead to step 3:
12 can be fit into 67 5 times, resulting in a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 60 away from 67, we end up with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 12

Going ahead to step 4:
If we divide 74 by 12, we get 6 and a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 156.0
Deduct 72 from 74 and we're left with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 12

On to step 5:
12 can be fit into 29 2 times, resulting in a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 1562.0
Subtract 24 from 29 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 12

Step 6:
The number 12 fits into 51 4 times, leaving a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 15624.0
Subtract 48 from 51 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.

Moving on to step 7:
12 can be fit into 30 2 times, resulting in a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 15624.2
Subtract 24 from 30 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 15624.25
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.

Let's proceed to step 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 15624.25
Deduct 0 from 0 and we're left 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.

Going ahead to step 10:
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: 15624.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 15624.25 with a remaining 0.0.