We look at the division of 61821 by 12 
The aim is to understand the frequency of 12 in 61821.

Step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 12

Moving on to step 2:
When dividing 61 by 12, we get 5 with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 60 from 61, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 12

Moving on to step 3:
If we divide 18 by 12, we get 1 and a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 51.0
The remainder is 6 after subtracting 12 from 18.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 12

Step 4:
The number 12 fits into 62 5 times, leaving a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 515.0
The remainder is 2 after subtracting 60 from 62.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 12

Let's proceed to step 5:
If we divide 21 by 12, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 5151.0
Subtracting 12 from 21 leaves us 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.

On to step 6:
When dividing 90 by 12, we get 7 with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 5151.7
The remainder is 6 after subtracting 84 from 90.
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 7:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5151.75
Subtracting 60 from 60 leaves us 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.

On to step 8:
12 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5151.75
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.

On to step 9:
When dividing 0 by 12, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5151.75
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.

After the division, we end up with 5151.75 and a remainder of 0.0.