We look at the division of 453993 by 1 
The aim is to understand the frequency of 1 in 453993.

Going ahead to step 1:
1 goes into 4 4 times with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 4 from 4, we get 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 1

Moving on to step 2:
1 goes into 5 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 45.0
If we subtract 5 from 5, we get 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 1

On to step 3:
1 goes into 3 3 times with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 453.0
Subtracting 3 from 3 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 1

Let's proceed to step 4:
The number 1 fits into 9 9 times, leaving a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 4539.0
Subtract 9 from 9 to get 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 1

Let's proceed to step 5:
1 goes into 9 9 times with a remainder of 0.
The next digit of our result is 9. 
Result so far: 45399.0
If we take 9 away from 9, we end up with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 1

Going ahead to step 6:
1 can be fit into 3 3 times, resulting in a remainder of 0.
The next digit of our result is 3. 
Result so far: 453993.0
Subtract 3 from 3 to 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.

Let's proceed to step 7:
If we divide 0 by 1, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 453993.0
Deduct 0 from 0 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.

Step 8:
0 divided by 1 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 453993.0
Subtract 0 from 0 to 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.

Our division results in 453993.0 with a remaining 0.0.