31455369 divided by 421 
The aim is to understand the frequency of 421 in 31455369.

Let's proceed to step 1:
421 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 421

Step 2:
421 can be fit into 31 0 times, resulting in a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Bring next digit (4) of the dividend behind the 31 and repeat the process: 314 / 421

Step 3:
314 divided by 421 is 0 with a remainder of 314.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 314 and we're left with 314.
Fetch the next digit (5) from the dividend, attach it to 314 and continue: 3145 / 421

Going ahead to step 4:
421 goes into 3145 7 times with a remainder of 198.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 2947 from 3145, we get 198.
Append the next digit (5) from the dividend to 198 and continue with: 1985 / 421

Going ahead to step 5:
1985 divided by 421 is 4 with a remainder of 301.
Use 4 as the next digit of our solution. 
Result so far: 74.0
Subtracting 1684 from 1985 leaves us with 301.
Grab the next digit (3) from the dividend, add it to 301, then carry on: 3013 / 421

Moving on to step 6:
421 goes into 3013 7 times with a remainder of 66.
Use 7 as the next digit of our solution. 
Result so far: 747.0
If we subtract 2947 from 3013, we get 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 421

Step 7:
666 divided by 421 is 1 with a remainder of 245.
Use 1 as the next digit of our solution. 
Result so far: 7471.0
The remainder is 245 after subtracting 421 from 666.
Append the next digit (9) from the dividend to 245 and continue with: 2459 / 421

Going ahead to step 8:
421 goes into 2459 5 times with a remainder of 354.
Write down 5 as next digit of the result. 
Result so far: 74715.0
If we take 2105 away from 2459, we end up with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Let's proceed to step 9:
3540 divided by 421 is 8 with a remainder of 172.
Write down 8 as next digit of the result. 
Result so far: 74715.8
Subtracting 3368 from 3540 leaves us with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Let's proceed to step 10:
The number 421 fits into 1720 4 times, leaving a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 74715.84
If we subtract 1684 from 1720, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 11:
421 can be fit into 360 0 times, resulting in a remainder of 360.
Use 0 as the next digit of our solution. 
Result so far: 74715.84
If we subtract 0 from 360, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 12:
The number 421 fits into 3600 8 times, leaving a remainder of 232.
Put 8 as the next digit of the answer. 
Result so far: 74715.8408
Subtracting 3368 from 3600 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Advancing to step 13:
When dividing 2320 by 421, we get 5 with a remainder of 215.
Write down 5 as next digit of the result. 
Result so far: 74715.84085
Subtracting 2105 from 2320 leaves us with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

On to step 14:
When dividing 2150 by 421, we get 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 74715.840855
If we subtract 2105 from 2150, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The final outcome is 74715.840855, with a leftover of 4.5e-06.