149375 ÷ 90 
The aim is to understand the frequency of 90 in 149375.

Let's proceed to step 1:
When dividing 1 by 90, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 90

Moving on to step 2:
The number 90 fits into 14 0 times, leaving a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 14 leaves us with 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 90

On to step 3:
90 goes into 149 1 times with a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 90 from 149 and we're left with 59.
Take the next digit (3) from the dividend and append it to 59, then repeat: 593 / 90

Let's proceed to step 4:
90 goes into 593 6 times with a remainder of 53.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 540 from 593 to get 53.
Append the next digit (7) from the dividend to 53 and continue with: 537 / 90

On to step 5:
537 divided by 90 is 5 with a remainder of 87.
Write down 5 as next digit of the result. 
Result so far: 165.0
Subtracting 450 from 537 leaves us with 87.
Bring next digit (5) of the dividend behind the 87 and repeat the process: 875 / 90

Advancing to step 6:
If we divide 875 by 90, we get 9 and a remainder of 65.
Write down 9 as next digit of the result. 
Result so far: 1659.0
Subtract 810 from 875 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
The number 90 fits into 650 7 times, leaving a remainder of 20.
The number 7 becomes the next digit in our result. 
Result so far: 1659.7
If we subtract 630 from 650, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
When dividing 200 by 90, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 1659.72
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
If we divide 200 by 90, we get 2 and a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 1659.722
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 1659.722 with a remaining 0.002.