387289 ÷ 90 
The aim is to understand the frequency of 90 in 387289.

Going ahead to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 90

Moving on to step 2:
If we divide 38 by 90, we get 0 and a remainder of 38.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 38, we end up with 38.
Include the next digit (7) from the dividend after 38, then repeat: 387 / 90

Let's proceed to step 3:
The number 90 fits into 387 4 times, leaving a remainder of 27.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 360 from 387 and we're left with 27.
Take the next digit (2) from the dividend and append it to 27, then repeat: 272 / 90

On to step 4:
90 can be fit into 272 3 times, resulting in a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Subtracting 270 from 272 leaves us with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 90

Let's proceed to step 5:
The number 90 fits into 28 0 times, leaving a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 430.0
Subtract 0 from 28 to get 28.
Bring next digit (9) of the dividend behind the 28 and repeat the process: 289 / 90

Step 6:
The number 90 fits into 289 3 times, leaving a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 4303.0
If we take 270 away from 289, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
90 goes into 190 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 4303.2
If we subtract 180 from 190, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
90 goes into 100 1 times with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 4303.21
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
100 divided by 90 is 1 with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 4303.211
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 4303.211 with a remaining 0.001.