355016 divided by 90 
The aim is to understand the frequency of 90 in 355016.

Moving on to step 1:
3 divided by 90 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 90

On to step 2:
The number 90 fits into 35 0 times, leaving a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Include the next digit (5) from the dividend after 35, then repeat: 355 / 90

Going ahead to step 3:
When dividing 355 by 90, we get 3 with a remainder of 85.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 270 from 355 to get 85.
Append the next digit (0) from the dividend to 85 and continue with: 850 / 90

Going ahead to step 4:
90 can be fit into 850 9 times, resulting in a remainder of 40.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we subtract 810 from 850, we get 40.
Grab the next digit (1) from the dividend, add it to 40, then carry on: 401 / 90

Moving on to step 5:
If we divide 401 by 90, we get 4 and a remainder of 41.
The number 4 becomes the next digit in our result. 
Result so far: 394.0
If we take 360 away from 401, we end up with 41.
Fetch the next digit (6) from the dividend, attach it to 41 and continue: 416 / 90

Let's proceed to step 6:
If we divide 416 by 90, we get 4 and a remainder of 56.
The next digit of our result is 4. 
Result so far: 3944.0
If we subtract 360 from 416, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 7:
When dividing 560 by 90, we get 6 with a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 3944.6
Subtract 540 from 560 to 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:
90 can be fit into 200 2 times, resulting in a remainder of 20.
The next digit of our result is 2. 
Result so far: 3944.62
Subtract 180 from 200 to 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.

Going ahead to step 9:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 3944.622
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.

After the division, we end up with 3944.622 and a remainder of 0.002.