609674 ÷ 90 
The aim is to understand the frequency of 90 in 609674.

Let's proceed to step 1:
The number 90 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 90

Going ahead to step 2:
When dividing 60 by 90, we get 0 with a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 60 leaves us with 60.
Bring next digit (9) of the dividend behind the 60 and repeat the process: 609 / 90

Advancing to step 3:
When dividing 609 by 90, we get 6 with a remainder of 69.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 69 after subtracting 540 from 609.
Fetch the next digit (6) from the dividend, attach it to 69 and continue: 696 / 90

Let's proceed to step 4:
If we divide 696 by 90, we get 7 and a remainder of 66.
Record the quotient 7 as the next digit in the result. 
Result so far: 67.0
Deduct 630 from 696 and we're left with 66.
Bring next digit (7) of the dividend behind the 66 and repeat the process: 667 / 90

Going ahead to step 5:
When dividing 667 by 90, we get 7 with a remainder of 37.
The next digit of our result is 7. 
Result so far: 677.0
If we subtract 630 from 667, we get 37.
Fetch the next digit (4) from the dividend, attach it to 37 and continue: 374 / 90

Let's proceed to step 6:
When dividing 374 by 90, we get 4 with a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 6774.0
Subtracting 360 from 374 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
The number 90 fits into 140 1 times, leaving a remainder of 50.
The number 1 becomes the next digit in our result. 
Result so far: 6774.1
The remainder is 50 after subtracting 90 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 8:
If we divide 500 by 90, we get 5 and a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 6774.15
The remainder is 50 after subtracting 450 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 9:
The number 90 fits into 500 5 times, leaving a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 6774.155
The remainder is 50 after subtracting 450 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 6774.155 and a remainder of 0.005.