Let's divide 91238991 by 429
The aim is to understand the frequency of 429 in 91238991.

Step 1:
429 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 429

Moving on to step 2:
429 goes into 91 0 times with a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 91 after subtracting 0 from 91.
Append the next digit (2) from the dividend to 91 and continue with: 912 / 429

Step 3:
429 goes into 912 2 times with a remainder of 54.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 858 from 912 to get 54.
Append the next digit (3) from the dividend to 54 and continue with: 543 / 429

Let's proceed to step 4:
429 can be fit into 543 1 times, resulting in a remainder of 114.
The next digit of our result is 1. 
Result so far: 21.0
The remainder is 114 after subtracting 429 from 543.
Fetch the next digit (8) from the dividend, attach it to 114 and continue: 1148 / 429

Going ahead to step 5:
429 goes into 1148 2 times with a remainder of 290.
The next digit of our result is 2. 
Result so far: 212.0
If we take 858 away from 1148, we end up with 290.
Take the next digit (9) from the dividend and append it to 290, then repeat: 2909 / 429

Step 6:
429 can be fit into 2909 6 times, resulting in a remainder of 335.
The next digit of our result is 6. 
Result so far: 2126.0
Subtracting 2574 from 2909 leaves us with 335.
Fetch the next digit (9) from the dividend, attach it to 335 and continue: 3359 / 429

Let's proceed to step 7:
If we divide 3359 by 429, we get 7 and a remainder of 356.
Put 7 as the next digit of the answer. 
Result so far: 21267.0
Deduct 3003 from 3359 and we're left with 356.
Bring next digit (1) of the dividend behind the 356 and repeat the process: 3561 / 429

Let's proceed to step 8:
The number 429 fits into 3561 8 times, leaving a remainder of 129.
The number 8 becomes the next digit in our result. 
Result so far: 212678.0
If we take 3432 away from 3561, we end up with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

On to step 9:
429 goes into 1290 3 times with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 212678.3
Deduct 1287 from 1290 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 10:
The number 429 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 212678.3
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
300 divided by 429 is 0 with a remainder of 300.
The next digit of our result is 0. 
Result so far: 212678.3
Subtract 0 from 300 to get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Our division results in 212678.3 with a remaining 0.03.