We look at the division of 30403316 by 421 
The aim is to understand the frequency of 421 in 30403316.

Going ahead to step 1:
421 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 421

Going ahead to step 2:
30 divided by 421 is 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 30, we end up with 30.
Include the next digit (4) from the dividend after 30, then repeat: 304 / 421

Advancing to step 3:
421 can be fit into 304 0 times, resulting in a remainder of 304.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 304, we get 304.
Bring next digit (0) of the dividend behind the 304 and repeat the process: 3040 / 421

Moving on to step 4:
If we divide 3040 by 421, we get 7 and a remainder of 93.
The next digit of our result is 7. 
Result so far: 7.0
If we take 2947 away from 3040, we end up with 93.
Append the next digit (3) from the dividend to 93 and continue with: 933 / 421

Step 5:
421 can be fit into 933 2 times, resulting in a remainder of 91.
Use 2 as the next digit of our solution. 
Result so far: 72.0
If we take 842 away from 933, we end up with 91.
Fetch the next digit (3) from the dividend, attach it to 91 and continue: 913 / 421

Let's proceed to step 6:
The number 421 fits into 913 2 times, leaving a remainder of 71.
Record the quotient 2 as the next digit in the result. 
Result so far: 722.0
The remainder is 71 after subtracting 842 from 913.
Take the next digit (1) from the dividend and append it to 71, then repeat: 711 / 421

Step 7:
When dividing 711 by 421, we get 1 with a remainder of 290.
The number 1 becomes the next digit in our result. 
Result so far: 7221.0
The remainder is 290 after subtracting 421 from 711.
Append the next digit (6) from the dividend to 290 and continue with: 2906 / 421

Advancing to step 8:
When dividing 2906 by 421, we get 6 with a remainder of 380.
The number 6 becomes the next digit in our result. 
Result so far: 72216.0
Subtracting 2526 from 2906 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 9:
421 can be fit into 3800 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 72216.9
The remainder is 11 after subtracting 3789 from 3800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
When dividing 110 by 421, we get 0 with a remainder of 110.
The next digit of our result is 0. 
Result so far: 72216.9
Subtracting 0 from 110 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 11:
When dividing 1100 by 421, we get 2 with a remainder of 258.
Put 2 as the next digit of the answer. 
Result so far: 72216.902
If we take 842 away from 1100, we end up with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Advancing to step 12:
421 goes into 2580 6 times with a remainder of 54.
The next digit of our result is 6. 
Result so far: 72216.9026
Subtracting 2526 from 2580 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 13:
421 goes into 540 1 times with a remainder of 119.
The number 1 becomes the next digit in our result. 
Result so far: 72216.90261
If we take 421 away from 540, we end up with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 14:
421 can be fit into 1190 2 times, resulting in a remainder of 348.
Record the quotient 2 as the next digit in the result. 
Result so far: 72216.902612
Subtracting 842 from 1190 leaves us with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Going ahead to step 15:
421 can be fit into 3480 8 times, resulting in a remainder of 112.
The number 8 becomes the next digit in our result. 
Result so far: 72216.9026128
Subtract 3368 from 3480 to 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 16:
If we divide 1120 by 421, we get 2 and a remainder of 278.
The number 2 becomes the next digit in our result. 
Result so far: 72216.90261282
Deduct 842 from 1120 and we're left with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

In conclusion, the division gives 72216.90261282 with a balance of 2.78e-07.