We're dividing 90970634 by 451 
The aim is to understand the frequency of 451 in 90970634.

Advancing to step 1:
When dividing 9 by 451, we get 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 451

Advancing to step 2:
When dividing 90 by 451, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 90 after subtracting 0 from 90.
Append the next digit (9) from the dividend to 90 and continue with: 909 / 451

Going ahead to step 3:
451 goes into 909 2 times with a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 902 from 909 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 451

Let's proceed to step 4:
77 divided by 451 is 0 with a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtract 0 from 77 to get 77.
Bring next digit (0) of the dividend behind the 77 and repeat the process: 770 / 451

Let's proceed to step 5:
770 divided by 451 is 1 with a remainder of 319.
The number 1 becomes the next digit in our result. 
Result so far: 201.0
Deduct 451 from 770 and we're left with 319.
Append the next digit (6) from the dividend to 319 and continue with: 3196 / 451

Moving on to step 6:
If we divide 3196 by 451, we get 7 and a remainder of 39.
Put 7 as the next digit of the answer. 
Result so far: 2017.0
If we take 3157 away from 3196, we end up with 39.
Fetch the next digit (3) from the dividend, attach it to 39 and continue: 393 / 451

Moving on to step 7:
451 can be fit into 393 0 times, resulting in a remainder of 393.
Put 0 as the next digit of the answer. 
Result so far: 20170.0
Subtracting 0 from 393 leaves us with 393.
Bring next digit (4) of the dividend behind the 393 and repeat the process: 3934 / 451

Moving on to step 8:
If we divide 3934 by 451, we get 8 and a remainder of 326.
The next digit of our result is 8. 
Result so far: 201708.0
Deduct 3608 from 3934 and we're left with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Let's proceed to step 9:
451 goes into 3260 7 times with a remainder of 103.
Record the quotient 7 as the next digit in the result. 
Result so far: 201708.7
If we subtract 3157 from 3260, we get 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Advancing to step 10:
451 can be fit into 1030 2 times, resulting in a remainder of 128.
Record the quotient 2 as the next digit in the result. 
Result so far: 201708.72
Deduct 902 from 1030 and we're left with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 11:
451 goes into 1280 2 times with a remainder of 378.
The number 2 becomes the next digit in our result. 
Result so far: 201708.722
Deduct 902 from 1280 and we're left with 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

The final result is 201708.722 with a remainder of 0.0378.