We look at the division of 21530904 by 458 
The aim is to understand the frequency of 458 in 21530904.

Going ahead to step 1:
The number 458 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 458

On to step 2:
The number 458 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 458

Advancing to step 3:
458 can be fit into 215 0 times, resulting in a remainder of 215.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Append the next digit (3) from the dividend to 215 and continue with: 2153 / 458

Let's proceed to step 4:
458 goes into 2153 4 times with a remainder of 321.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 1832 from 2153 to get 321.
Append the next digit (0) from the dividend to 321 and continue with: 3210 / 458

Step 5:
458 can be fit into 3210 7 times, resulting in a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 47.0
If we take 3206 away from 3210, we end up with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 458

Advancing to step 6:
458 can be fit into 49 0 times, resulting in a remainder of 49.
Record the quotient 0 as the next digit in the result. 
Result so far: 470.0
If we take 0 away from 49, we end up with 49.
Bring next digit (0) of the dividend behind the 49 and repeat the process: 490 / 458

Advancing to step 7:
490 divided by 458 is 1 with a remainder of 32.
Put 1 as the next digit of the answer. 
Result so far: 4701.0
The remainder is 32 after subtracting 458 from 490.
Include the next digit (4) from the dividend after 32, then repeat: 324 / 458

On to step 8:
When dividing 324 by 458, we get 0 with a remainder of 324.
The next digit of our result is 0. 
Result so far: 47010.0
Deduct 0 from 324 and we're left with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Step 9:
3240 divided by 458 is 7 with a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 47010.7
Deduct 3206 from 3240 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 10:
When dividing 340 by 458, we get 0 with a remainder of 340.
Write down 0 as next digit of the result. 
Result so far: 47010.7
If we subtract 0 from 340, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Moving on to step 11:
When dividing 3400 by 458, we get 7 with a remainder of 194.
The next digit of our result is 7. 
Result so far: 47010.707
Subtracting 3206 from 3400 leaves us with 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Advancing to step 12:
458 can be fit into 1940 4 times, resulting in a remainder of 108.
Put 4 as the next digit of the answer. 
Result so far: 47010.7074
The remainder is 108 after subtracting 1832 from 1940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 13:
1080 divided by 458 is 2 with a remainder of 164.
The next digit of our result is 2. 
Result so far: 47010.70742
Subtract 916 from 1080 to get 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Advancing to step 14:
458 goes into 1640 3 times with a remainder of 266.
Use 3 as the next digit of our solution. 
Result so far: 47010.707423
Subtract 1374 from 1640 to get 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Step 15:
2660 divided by 458 is 5 with a remainder of 370.
Write down 5 as next digit of the result. 
Result so far: 47010.7074235
If we take 2290 away from 2660, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

On to step 16:
The number 458 fits into 3700 8 times, leaving a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 47010.70742358
Subtracting 3664 from 3700 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 47010.70742358 with a remainder of 3.6e-08.