512281 ÷ 12 
The aim is to understand the frequency of 12 in 512281.

On to step 1:
If we divide 5 by 12, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 12

Moving on to step 2:
51 divided by 12 is 4 with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 48 away from 51, we end up with 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 12

Moving on to step 3:
The number 12 fits into 32 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
If we subtract 24 from 32, we get 8.
Include the next digit (2) from the dividend after 8, then repeat: 82 / 12

Let's proceed to step 4:
12 can be fit into 82 6 times, resulting in a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 426.0
Deduct 72 from 82 and we're left with 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 12

Moving on to step 5:
12 can be fit into 108 9 times, resulting in a remainder of 0.
The next digit of our result is 9. 
Result so far: 4269.0
If we subtract 108 from 108, we get 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 12

Going ahead to step 6:
12 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 42690.0
If we take 0 away from 1, we end up 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.
Put 0 as the next digit of the answer. 
Result so far: 42690.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
12 can be fit into 100 8 times, resulting in a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 42690.08
Subtracting 96 from 100 leaves us 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.

Advancing to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 42690.083
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.

Let's proceed to step 10:
If we divide 40 by 12, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 42690.0833
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.

The final result is 42690.0833 with a remainder of 4e-05.