We look at the division of 51303494 by 458 
The aim is to understand the frequency of 458 in 51303494.

Advancing to step 1:
5 divided by 458 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 458

Moving on to step 2:
458 can be fit into 51 0 times, resulting in a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Take the next digit (3) from the dividend and append it to 51, then repeat: 513 / 458

Going ahead to step 3:
When dividing 513 by 458, we get 1 with a remainder of 55.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 458 away from 513, we end up with 55.
Bring next digit (0) of the dividend behind the 55 and repeat the process: 550 / 458

Moving on to step 4:
458 can be fit into 550 1 times, resulting in a remainder of 92.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we take 458 away from 550, we end up with 92.
Take the next digit (3) from the dividend and append it to 92, then repeat: 923 / 458

Advancing to step 5:
The number 458 fits into 923 2 times, leaving a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 112.0
If we subtract 916 from 923, we get 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 458

Moving on to step 6:
458 goes into 74 0 times with a remainder of 74.
Record the quotient 0 as the next digit in the result. 
Result so far: 1120.0
Subtracting 0 from 74 leaves us with 74.
Fetch the next digit (9) from the dividend, attach it to 74 and continue: 749 / 458

Going ahead to step 7:
458 goes into 749 1 times with a remainder of 291.
The next digit of our result is 1. 
Result so far: 11201.0
Deduct 458 from 749 and we're left with 291.
Fetch the next digit (4) from the dividend, attach it to 291 and continue: 2914 / 458

Going ahead to step 8:
The number 458 fits into 2914 6 times, leaving a remainder of 166.
Record the quotient 6 as the next digit in the result. 
Result so far: 112016.0
Deduct 2748 from 2914 and we're left with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Going ahead to step 9:
458 can be fit into 1660 3 times, resulting in a remainder of 286.
Put 3 as the next digit of the answer. 
Result so far: 112016.3
Subtract 1374 from 1660 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 10:
458 can be fit into 2860 6 times, resulting in a remainder of 112.
Put 6 as the next digit of the answer. 
Result so far: 112016.36
If we subtract 2748 from 2860, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 11:
458 goes into 1120 2 times with a remainder of 204.
Record the quotient 2 as the next digit in the result. 
Result so far: 112016.362
The remainder is 204 after subtracting 916 from 1120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

On to step 12:
When dividing 2040 by 458, we get 4 with a remainder of 208.
The next digit of our result is 4. 
Result so far: 112016.3624
The remainder is 208 after subtracting 1832 from 2040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Let's proceed to step 13:
If we divide 2080 by 458, we get 4 and a remainder of 248.
The number 4 becomes the next digit in our result. 
Result so far: 112016.36244
Deduct 1832 from 2080 and we're left with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

The final outcome is 112016.36244, with a leftover of 0.000248.