We look at the division of 21435281 by 455 
The aim is to understand the frequency of 455 in 21435281.

On to step 1:
When dividing 2 by 455, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 455

Moving on to step 2:
455 goes into 21 0 times with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (4) from the dividend to 21 and continue with: 214 / 455

Moving on to step 3:
The number 455 fits into 214 0 times, leaving a remainder of 214.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 214, we get 214.
Include the next digit (3) from the dividend after 214, then repeat: 2143 / 455

Moving on to step 4:
When dividing 2143 by 455, we get 4 with a remainder of 323.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 1820 away from 2143, we end up with 323.
Append the next digit (5) from the dividend to 323 and continue with: 3235 / 455

Step 5:
455 goes into 3235 7 times with a remainder of 50.
Put 7 as the next digit of the answer. 
Result so far: 47.0
The remainder is 50 after subtracting 3185 from 3235.
Bring next digit (2) of the dividend behind the 50 and repeat the process: 502 / 455

Let's proceed to step 6:
If we divide 502 by 455, we get 1 and a remainder of 47.
Record the quotient 1 as the next digit in the result. 
Result so far: 471.0
Deduct 455 from 502 and we're left with 47.
Append the next digit (8) from the dividend to 47 and continue with: 478 / 455

Going ahead to step 7:
If we divide 478 by 455, we get 1 and a remainder of 23.
Write down 1 as next digit of the result. 
Result so far: 4711.0
If we take 455 away from 478, we end up with 23.
Grab the next digit (1) from the dividend, add it to 23, then carry on: 231 / 455

Let's proceed to step 8:
455 goes into 231 0 times with a remainder of 231.
Use 0 as the next digit of our solution. 
Result so far: 47110.0
If we subtract 0 from 231, we get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Moving on to step 9:
When dividing 2310 by 455, we get 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 47110.5
If we subtract 2275 from 2310, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 10:
455 can be fit into 350 0 times, resulting in a remainder of 350.
The number 0 becomes the next digit in our result. 
Result so far: 47110.5
Deduct 0 from 350 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Let's proceed to step 11:
If we divide 3500 by 455, we get 7 and a remainder of 315.
The number 7 becomes the next digit in our result. 
Result so far: 47110.507
If we subtract 3185 from 3500, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Going ahead to step 12:
When dividing 3150 by 455, we get 6 with a remainder of 420.
The next digit of our result is 6. 
Result so far: 47110.5076
Subtracting 2730 from 3150 leaves us with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Advancing to step 13:
455 can be fit into 4200 9 times, resulting in a remainder of 105.
Use 9 as the next digit of our solution. 
Result so far: 47110.50769
Deduct 4095 from 4200 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 14:
455 can be fit into 1050 2 times, resulting in a remainder of 140.
Record the quotient 2 as the next digit in the result. 
Result so far: 47110.507692
Subtract 910 from 1050 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 15:
1400 divided by 455 is 3 with a remainder of 35.
Use 3 as the next digit of our solution. 
Result so far: 47110.5076923
Subtract 1365 from 1400 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 16:
350 divided by 455 is 0 with a remainder of 350.
Record the quotient 0 as the next digit in the result. 
Result so far: 47110.5076923
If we take 0 away from 350, we end up with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

The final outcome is 47110.5076923, with a leftover of 3.5e-07.