We divide 724569 by 90
The aim is to understand the frequency of 90 in 724569.

Let's proceed to step 1:
If we divide 7 by 90, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 90

Moving on to step 2:
When dividing 72 by 90, we get 0 with a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Take the next digit (4) from the dividend and append it to 72, then repeat: 724 / 90

Going ahead to step 3:
90 goes into 724 8 times with a remainder of 4.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 720 from 724 and we're left with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 90

Going ahead to step 4:
90 can be fit into 45 0 times, resulting in a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 80.0
If we subtract 0 from 45, we get 45.
Include the next digit (6) from the dividend after 45, then repeat: 456 / 90

Let's proceed to step 5:
90 goes into 456 5 times with a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 805.0
Deduct 450 from 456 and we're left with 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 90

Step 6:
69 divided by 90 is 0 with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 8050.0
If we take 0 away from 69, we end up 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.

On to step 7:
The number 90 fits into 690 7 times, leaving a remainder of 60.
The number 7 becomes the next digit in our result. 
Result so far: 8050.7
Subtract 630 from 690 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
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: 8050.76
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 8050.766
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.

After the division, we end up with 8050.766 and a remainder of 0.006.