We're dividing 353752 by 90 
The aim is to understand the frequency of 90 in 353752.

Advancing to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 90

Let's proceed to step 2:
35 divided by 90 is 0 with a remainder of 35.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 35 leaves us with 35.
Bring next digit (3) of the dividend behind the 35 and repeat the process: 353 / 90

Moving on to step 3:
When dividing 353 by 90, we get 3 with a remainder of 83.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 83 after subtracting 270 from 353.
Fetch the next digit (7) from the dividend, attach it to 83 and continue: 837 / 90

Moving on to step 4:
The number 90 fits into 837 9 times, leaving a remainder of 27.
Write down 9 as next digit of the result. 
Result so far: 39.0
Subtracting 810 from 837 leaves us with 27.
Bring next digit (5) of the dividend behind the 27 and repeat the process: 275 / 90

Advancing to step 5:
If we divide 275 by 90, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 393.0
If we take 270 away from 275, we end up with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 90

Moving on to step 6:
When dividing 52 by 90, we get 0 with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 3930.0
If we take 0 away from 52, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 7:
When dividing 520 by 90, we get 5 with a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 3930.5
If we subtract 450 from 520, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
If we divide 700 by 90, we get 7 and a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 3930.57
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 9:
If we divide 700 by 90, we get 7 and a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 3930.577
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 3930.577 and a remainder of 0.007.