We're dividing 190521 by 12 
We want to figure out the number of times 190521 can be divided by 12.

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
Deduct 0 from 1 and we're left with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 12

Going ahead to step 2:
If we divide 19 by 12, we get 1 and a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 12 from 19 and we're left with 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 12

On to step 3:
12 goes into 70 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 15.0
If we take 60 away from 70, we end up with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 12

Going ahead to step 4:
105 divided by 12 is 8 with a remainder of 9.
The next digit of our result is 8. 
Result so far: 158.0
Subtracting 96 from 105 leaves us with 9.
Include the next digit (2) from the dividend after 9, then repeat: 92 / 12

Advancing to step 5:
12 can be fit into 92 7 times, resulting in a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 1587.0
Deduct 84 from 92 and we're left with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 12

Advancing to step 6:
12 goes into 81 6 times with a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 15876.0
Deduct 72 from 81 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
The number 12 fits into 90 7 times, leaving a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 15876.7
Subtracting 84 from 90 leaves us 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.

Going ahead to step 8:
When dividing 60 by 12, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 15876.75
Deduct 60 from 60 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 9:
0 divided by 12 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15876.75
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.

Step 10:
0 divided by 12 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15876.75
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 15876.75 and a remainder of 0.0.