Let's divide 495421 by 12
The aim is to understand the frequency of 12 in 495421.

On to step 1:
12 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 12

Step 2:
49 divided by 12 is 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 48 from 49 to get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 12

Advancing to step 3:
When dividing 15 by 12, we get 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 41.0
The remainder is 3 after subtracting 12 from 15.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 12

On to step 4:
The number 12 fits into 34 2 times, leaving a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 412.0
Deduct 24 from 34 and we're left with 10.
Append the next digit (2) from the dividend to 10 and continue with: 102 / 12

Advancing to step 5:
12 can be fit into 102 8 times, resulting in a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 4128.0
Deduct 96 from 102 and we're left with 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 12

Let's proceed to step 6:
61 divided by 12 is 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 41285.0
Subtracting 60 from 61 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
If we divide 10 by 12, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 41285.0
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
When dividing 100 by 12, we get 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 41285.08
If we take 96 away from 100, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 41285.083
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
When dividing 40 by 12, we get 3 with a remainder of 4.
The next digit of our result is 3. 
Result so far: 41285.0833
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 41285.0833 and a remainder of 4e-05.