420675 ÷ 12 
The aim is to understand the frequency of 12 in 420675.

On to step 1:
When dividing 4 by 12, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 12

Advancing to step 2:
42 divided by 12 is 3 with a remainder of 6.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 6 after subtracting 36 from 42.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 12

On to step 3:
When dividing 60 by 12, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Deduct 60 from 60 and we're left with 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 12

On to step 4:
12 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 350.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 12

Going ahead to step 5:
The number 12 fits into 67 5 times, leaving a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 3505.0
Subtract 60 from 67 to get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 12

Moving on to step 6:
When dividing 75 by 12, we get 6 with a remainder of 3.
The next digit of our result is 6. 
Result so far: 35056.0
If we take 72 away from 75, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
When dividing 30 by 12, we get 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 35056.2
Subtracting 24 from 30 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.

Moving on to step 8:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 35056.25
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.

Advancing to step 9:
12 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 35056.25
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.

On to step 10:
The number 12 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 35056.25
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.

The final result is 35056.25 with a remainder of 0.0.