We look at the division of 2808873 by 421 
The aim is to understand the frequency of 421 in 2808873.

Step 1:
421 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 421

Let's proceed to step 2:
When dividing 28 by 421, we get 0 with a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 28 after subtracting 0 from 28.
Append the next digit (0) from the dividend to 28 and continue with: 280 / 421

On to step 3:
421 can be fit into 280 0 times, resulting in a remainder of 280.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 280 leaves us with 280.
Grab the next digit (8) from the dividend, add it to 280, then carry on: 2808 / 421

On to step 4:
421 can be fit into 2808 6 times, resulting in a remainder of 282.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 2526 from 2808, we get 282.
Bring next digit (8) of the dividend behind the 282 and repeat the process: 2828 / 421

Going ahead to step 5:
2828 divided by 421 is 6 with a remainder of 302.
Use 6 as the next digit of our solution. 
Result so far: 66.0
Subtracting 2526 from 2828 leaves us with 302.
Append the next digit (7) from the dividend to 302 and continue with: 3027 / 421

Advancing to step 6:
421 goes into 3027 7 times with a remainder of 80.
Write down 7 as next digit of the result. 
Result so far: 667.0
If we subtract 2947 from 3027, we get 80.
Grab the next digit (3) from the dividend, add it to 80, then carry on: 803 / 421

Step 7:
421 goes into 803 1 times with a remainder of 382.
The next digit of our result is 1. 
Result so far: 6671.0
Subtract 421 from 803 to get 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Step 8:
3820 divided by 421 is 9 with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 6671.9
If we subtract 3789 from 3820, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 9:
If we divide 310 by 421, we get 0 and a remainder of 310.
Record the quotient 0 as the next digit in the result. 
Result so far: 6671.9
Deduct 0 from 310 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Advancing to step 10:
421 goes into 3100 7 times with a remainder of 153.
Write down 7 as next digit of the result. 
Result so far: 6671.907
Subtract 2947 from 3100 to get 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Moving on to step 11:
421 goes into 1530 3 times with a remainder of 267.
Use 3 as the next digit of our solution. 
Result so far: 6671.9073
If we subtract 1263 from 1530, we get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Advancing to step 12:
421 can be fit into 2670 6 times, resulting in a remainder of 144.
Record the quotient 6 as the next digit in the result. 
Result so far: 6671.90736
Deduct 2526 from 2670 and we're left with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

On to step 13:
When dividing 1440 by 421, we get 3 with a remainder of 177.
Use 3 as the next digit of our solution. 
Result so far: 6671.907363
Subtracting 1263 from 1440 leaves us with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Going ahead to step 14:
1770 divided by 421 is 4 with a remainder of 86.
Record the quotient 4 as the next digit in the result. 
Result so far: 6671.9073634
Subtracting 1684 from 1770 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 15:
When dividing 860 by 421, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 6671.90736342
Subtracting 842 from 860 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 6671.90736342 with a remaining 1.8e-08.