We're dividing 21503056 by 459 
The aim is to understand the frequency of 459 in 21503056.

On to step 1:
459 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 459

Moving on to step 2:
If we divide 21 by 459, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 459

Moving on to step 3:
When dividing 215 by 459, we get 0 with a remainder of 215.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 215, we end up with 215.
Grab the next digit (0) from the dividend, add it to 215, then carry on: 2150 / 459

Moving on to step 4:
2150 divided by 459 is 4 with a remainder of 314.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 1836 from 2150, we get 314.
Append the next digit (3) from the dividend to 314 and continue with: 3143 / 459

Let's proceed to step 5:
3143 divided by 459 is 6 with a remainder of 389.
The number 6 becomes the next digit in our result. 
Result so far: 46.0
If we subtract 2754 from 3143, we get 389.
Fetch the next digit (0) from the dividend, attach it to 389 and continue: 3890 / 459

Moving on to step 6:
The number 459 fits into 3890 8 times, leaving a remainder of 218.
Record the quotient 8 as the next digit in the result. 
Result so far: 468.0
If we take 3672 away from 3890, we end up with 218.
Include the next digit (5) from the dividend after 218, then repeat: 2185 / 459

Step 7:
2185 divided by 459 is 4 with a remainder of 349.
The next digit of our result is 4. 
Result so far: 4684.0
If we subtract 1836 from 2185, we get 349.
Take the next digit (6) from the dividend and append it to 349, then repeat: 3496 / 459

Advancing to step 8:
459 can be fit into 3496 7 times, resulting in a remainder of 283.
Put 7 as the next digit of the answer. 
Result so far: 46847.0
If we subtract 3213 from 3496, we get 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Advancing to step 9:
2830 divided by 459 is 6 with a remainder of 76.
The number 6 becomes the next digit in our result. 
Result so far: 46847.6
Subtracting 2754 from 2830 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 10:
760 divided by 459 is 1 with a remainder of 301.
The next digit of our result is 1. 
Result so far: 46847.61
Subtract 459 from 760 to get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Going ahead to step 11:
459 goes into 3010 6 times with a remainder of 256.
Put 6 as the next digit of the answer. 
Result so far: 46847.616
If we take 2754 away from 3010, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Step 12:
2560 divided by 459 is 5 with a remainder of 265.
The next digit of our result is 5. 
Result so far: 46847.6165
Subtracting 2295 from 2560 leaves us with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Let's proceed to step 13:
459 goes into 2650 5 times with a remainder of 355.
The number 5 becomes the next digit in our result. 
Result so far: 46847.61655
Deduct 2295 from 2650 and we're left with 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

The final result is 46847.61655 with a remainder of 0.000355.