We divide 573965 by 90
The aim is to understand the frequency of 90 in 573965.

Going ahead to step 1:
The number 90 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 90

Advancing to step 2:
The number 90 fits into 57 0 times, leaving a remainder of 57.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Append the next digit (3) from the dividend to 57 and continue with: 573 / 90

Advancing to step 3:
When dividing 573 by 90, we get 6 with a remainder of 33.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 540 from 573 leaves us with 33.
Fetch the next digit (9) from the dividend, attach it to 33 and continue: 339 / 90

Step 4:
The number 90 fits into 339 3 times, leaving a remainder of 69.
Put 3 as the next digit of the answer. 
Result so far: 63.0
Subtracting 270 from 339 leaves us with 69.
Include the next digit (6) from the dividend after 69, then repeat: 696 / 90

Let's proceed to step 5:
696 divided by 90 is 7 with a remainder of 66.
The number 7 becomes the next digit in our result. 
Result so far: 637.0
If we take 630 away from 696, we end up with 66.
Include the next digit (5) from the dividend after 66, then repeat: 665 / 90

Moving on to step 6:
When dividing 665 by 90, we get 7 with a remainder of 35.
The next digit of our result is 7. 
Result so far: 6377.0
Subtracting 630 from 665 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 7:
350 divided by 90 is 3 with a remainder of 80.
The next digit of our result is 3. 
Result so far: 6377.3
Deduct 270 from 350 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 8:
When dividing 800 by 90, we get 8 with a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 6377.38
The remainder is 80 after subtracting 720 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 9:
The number 90 fits into 800 8 times, leaving a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 6377.388
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Our division results in 6377.388 with a remaining 0.008.