We look at the division of 583220 by 12 
The aim is to understand the frequency of 12 in 583220.

Step 1:
When dividing 5 by 12, we get 0 with 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 (8) from the dividend, add it to 5, then carry on: 58 / 12

Let's proceed to step 2:
The number 12 fits into 58 4 times, leaving a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 10 after subtracting 48 from 58.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 12

Advancing to step 3:
12 goes into 103 8 times with a remainder of 7.
Put 8 as the next digit of the answer. 
Result so far: 48.0
Subtract 96 from 103 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 12

Going ahead to step 4:
12 goes into 72 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 486.0
Subtract 72 from 72 to get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 12

Step 5:
12 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 4860.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 12

Going ahead to step 6:
12 goes into 20 1 times with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 48601.0
If we subtract 12 from 20, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
12 can be fit into 80 6 times, resulting in a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 48601.6
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
12 can be fit into 80 6 times, resulting in a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 48601.66
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 48601.66 with a remainder of 0.008.