308989 ÷ 90 
The aim is to understand the frequency of 90 in 308989.

Step 1:
3 divided by 90 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 90

Moving on to step 2:
90 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Fetch the next digit (8) from the dividend, attach it to 30 and continue: 308 / 90

On to step 3:
The number 90 fits into 308 3 times, leaving a remainder of 38.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 270 from 308, we get 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 90

Advancing to step 4:
90 goes into 389 4 times with a remainder of 29.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we take 360 away from 389, we end up with 29.
Bring next digit (8) of the dividend behind the 29 and repeat the process: 298 / 90

Step 5:
If we divide 298 by 90, we get 3 and a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 343.0
If we subtract 270 from 298, we get 28.
Include the next digit (9) from the dividend after 28, then repeat: 289 / 90

Advancing to step 6:
If we divide 289 by 90, we get 3 and a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 3433.0
The remainder is 19 after subtracting 270 from 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 7:
90 goes into 190 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 3433.2
The remainder is 10 after subtracting 180 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
90 goes into 100 1 times with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 3433.21
If we take 90 away from 100, we end up with 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 9:
90 goes into 100 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 3433.211
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 3433.211 with a remainder of 0.001.