89130939 ÷ 421 
The aim is to understand the frequency of 421 in 89130939.

Let's proceed to step 1:
421 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 421

Moving on to step 2:
421 goes into 89 0 times with a remainder of 89.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 89 and we're left with 89.
Append the next digit (1) from the dividend to 89 and continue with: 891 / 421

Step 3:
421 goes into 891 2 times with a remainder of 49.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 842 from 891, we get 49.
Fetch the next digit (3) from the dividend, attach it to 49 and continue: 493 / 421

On to step 4:
421 can be fit into 493 1 times, resulting in a remainder of 72.
Put 1 as the next digit of the answer. 
Result so far: 21.0
The remainder is 72 after subtracting 421 from 493.
Bring next digit (0) of the dividend behind the 72 and repeat the process: 720 / 421

Advancing to step 5:
421 can be fit into 720 1 times, resulting in a remainder of 299.
Record the quotient 1 as the next digit in the result. 
Result so far: 211.0
Subtracting 421 from 720 leaves us with 299.
Take the next digit (9) from the dividend and append it to 299, then repeat: 2999 / 421

On to step 6:
If we divide 2999 by 421, we get 7 and a remainder of 52.
The number 7 becomes the next digit in our result. 
Result so far: 2117.0
Subtracting 2947 from 2999 leaves us with 52.
Include the next digit (3) from the dividend after 52, then repeat: 523 / 421

Step 7:
421 goes into 523 1 times with a remainder of 102.
Use 1 as the next digit of our solution. 
Result so far: 21171.0
The remainder is 102 after subtracting 421 from 523.
Append the next digit (9) from the dividend to 102 and continue with: 1029 / 421

On to step 8:
When dividing 1029 by 421, we get 2 with a remainder of 187.
Put 2 as the next digit of the answer. 
Result so far: 211712.0
The remainder is 187 after subtracting 842 from 1029.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

On to step 9:
421 goes into 1870 4 times with a remainder of 186.
The next digit of our result is 4. 
Result so far: 211712.4
Subtract 1684 from 1870 to get 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Moving on to step 10:
421 goes into 1860 4 times with a remainder of 176.
Use 4 as the next digit of our solution. 
Result so far: 211712.44
If we take 1684 away from 1860, we end up with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Our division results in 211712.44 with a remaining 0.176.