586380 divided by 12 
The aim is to understand the frequency of 12 in 586380.

On to step 1:
12 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 12

On to step 2:
When dividing 58 by 12, we get 4 with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 48 from 58 leaves us with 10.
Take the next digit (6) from the dividend and append it to 10, then repeat: 106 / 12

Going ahead to step 3:
106 divided by 12 is 8 with a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 48.0
The remainder is 10 after subtracting 96 from 106.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 12

Step 4:
The number 12 fits into 103 8 times, leaving a remainder of 7.
The next digit of our result is 8. 
Result so far: 488.0
The remainder is 7 after subtracting 96 from 103.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 12

Step 5:
The number 12 fits into 78 6 times, leaving a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 4886.0
Subtracting 72 from 78 leaves us with 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 12

Going ahead to step 6:
12 can be fit into 60 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 48865.0
Deduct 60 from 60 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.

Advancing to step 7:
If we divide 0 by 12, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 48865.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
If we divide 0 by 12, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 48865.0
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.

The final outcome is 48865.0, with a leftover of 0.0.