Let's divide 658969 by 90
The aim is to understand the frequency of 90 in 658969.

On to step 1:
When dividing 6 by 90, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 90

Let's proceed to step 2:
65 divided by 90 is 0 with a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 65, we get 65.
Fetch the next digit (8) from the dividend, attach it to 65 and continue: 658 / 90

Going ahead to step 3:
If we divide 658 by 90, we get 7 and a remainder of 28.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtract 630 from 658 to get 28.
Append the next digit (9) from the dividend to 28 and continue with: 289 / 90

Step 4:
90 goes into 289 3 times with a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 73.0
Deduct 270 from 289 and we're left with 19.
Fetch the next digit (6) from the dividend, attach it to 19 and continue: 196 / 90

Advancing to step 5:
196 divided by 90 is 2 with a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 732.0
Deduct 180 from 196 and we're left with 16.
Take the next digit (9) from the dividend and append it to 16, then repeat: 169 / 90

Moving on to step 6:
90 can be fit into 169 1 times, resulting in a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 7321.0
The remainder is 79 after subtracting 90 from 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 7:
90 goes into 790 8 times with a remainder of 70.
The number 8 becomes the next digit in our result. 
Result so far: 7321.8
Subtract 720 from 790 to 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.

Advancing 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: 7321.87
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.

On to step 9:
90 goes into 700 7 times with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 7321.877
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.

Our division results in 7321.877 with a remaining 0.007.