Let's divide 258485 by 12
The aim is to understand the frequency of 12 in 258485.

Moving on to step 1:
2 divided by 12 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 12

Advancing to step 2:
The number 12 fits into 25 2 times, leaving a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 24 from 25 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 12

Going ahead to step 3:
18 divided by 12 is 1 with a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 21.0
The remainder is 6 after subtracting 12 from 18.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 12

Let's proceed to step 4:
If we divide 64 by 12, we get 5 and a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 215.0
The remainder is 4 after subtracting 60 from 64.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 12

Step 5:
If we divide 48 by 12, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 2154.0
The remainder is 0 after subtracting 48 from 48.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 12

Advancing to step 6:
The number 12 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 21540.0
If we take 0 away from 5, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
12 can be fit into 50 4 times, resulting in a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 21540.4
Deduct 48 from 50 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
When dividing 20 by 12, we get 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 21540.41
Subtract 12 from 20 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.

Advancing to step 9:
12 goes into 80 6 times with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 21540.416
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.

Step 10:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 21540.4166
If we take 72 away from 80, we end up 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.

The final outcome is 21540.4166, with a leftover of 8e-05.