We're dividing 628591 by 12 
The aim is to understand the frequency of 12 in 628591.

Let's proceed to step 1:
6 divided by 12 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 12

Going ahead to step 2:
When dividing 62 by 12, we get 5 with a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 60 away from 62, we end up with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 12

Moving on to step 3:
28 divided by 12 is 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 52.0
Deduct 24 from 28 and we're left with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 12

Step 4:
45 divided by 12 is 3 with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 523.0
Subtracting 36 from 45 leaves us with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 12

Going ahead to step 5:
The number 12 fits into 99 8 times, leaving a remainder of 3.
The next digit of our result is 8. 
Result so far: 5238.0
Subtracting 96 from 99 leaves us with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 12

On to step 6:
If we divide 31 by 12, we get 2 and a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 52382.0
If we subtract 24 from 31, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
If we divide 70 by 12, we get 5 and a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 52382.5
Subtract 60 from 70 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
100 divided by 12 is 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 52382.58
If we subtract 96 from 100, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 52382.583
Deduct 36 from 40 and we're left 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 10:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 52382.5833
Subtracting 36 from 40 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.

The final outcome is 52382.5833, with a leftover of 4e-05.