903391 ÷ 12 
The aim is to understand the frequency of 12 in 903391.

Let's proceed to step 1:
The number 12 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 12

Going ahead to step 2:
12 can be fit into 90 7 times, resulting in a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 84 from 90 leaves us with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 12

Going ahead to step 3:
When dividing 63 by 12, we get 5 with a remainder of 3.
The next digit of our result is 5. 
Result so far: 75.0
Subtracting 60 from 63 leaves us with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 12

Let's proceed to step 4:
The number 12 fits into 33 2 times, leaving a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 752.0
Deduct 24 from 33 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 12

Moving on to step 5:
12 goes into 99 8 times with a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 7528.0
The remainder is 3 after subtracting 96 from 99.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 12

Moving on to step 6:
If we divide 31 by 12, we get 2 and a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 75282.0
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.

On to step 7:
70 divided by 12 is 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 75282.5
The remainder is 10 after subtracting 60 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
When dividing 100 by 12, we get 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 75282.58
Deduct 96 from 100 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.

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: 75282.583
The remainder is 4 after subtracting 36 from 40.
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:
40 divided by 12 is 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 75282.5833
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.

In conclusion, the division gives 75282.5833 with a balance of 4e-05.