We look at the division of 446649 by 90 
The aim is to understand the frequency of 90 in 446649.

Moving on to step 1:
If we divide 4 by 90, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 90

On to step 2:
If we divide 44 by 90, we get 0 and a remainder of 44.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 44 to get 44.
Bring next digit (6) of the dividend behind the 44 and repeat the process: 446 / 90

Let's proceed to step 3:
If we divide 446 by 90, we get 4 and a remainder of 86.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 360 from 446 leaves us with 86.
Fetch the next digit (6) from the dividend, attach it to 86 and continue: 866 / 90

Let's proceed to step 4:
90 goes into 866 9 times with a remainder of 56.
Use 9 as the next digit of our solution. 
Result so far: 49.0
Deduct 810 from 866 and we're left with 56.
Append the next digit (4) from the dividend to 56 and continue with: 564 / 90

Advancing to step 5:
90 can be fit into 564 6 times, resulting in a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 496.0
If we subtract 540 from 564, we get 24.
Include the next digit (9) from the dividend after 24, then repeat: 249 / 90

Going ahead to step 6:
90 goes into 249 2 times with a remainder of 69.
Write down 2 as next digit of the result. 
Result so far: 4962.0
Deduct 180 from 249 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 7:
90 can be fit into 690 7 times, resulting in a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 4962.7
The remainder is 60 after subtracting 630 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
When dividing 600 by 90, we get 6 with a remainder of 60.
The next digit of our result is 6. 
Result so far: 4962.76
Deduct 540 from 600 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
When dividing 600 by 90, we get 6 with a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 4962.766
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 4962.766, with a leftover of 0.006.