570985 ÷ 90 
The aim is to understand the frequency of 90 in 570985.

Let's proceed to step 1:
The number 90 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 90

Moving on to step 2:
90 goes into 57 0 times with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 57 to get 57.
Fetch the next digit (0) from the dividend, attach it to 57 and continue: 570 / 90

Going ahead to step 3:
570 divided by 90 is 6 with a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 30 after subtracting 540 from 570.
Include the next digit (9) from the dividend after 30, then repeat: 309 / 90

Let's proceed to step 4:
The number 90 fits into 309 3 times, leaving a remainder of 39.
Write down 3 as next digit of the result. 
Result so far: 63.0
If we subtract 270 from 309, we get 39.
Grab the next digit (8) from the dividend, add it to 39, then carry on: 398 / 90

Going ahead to step 5:
When dividing 398 by 90, we get 4 with a remainder of 38.
Write down 4 as next digit of the result. 
Result so far: 634.0
Deduct 360 from 398 and we're left with 38.
Grab the next digit (5) from the dividend, add it to 38, then carry on: 385 / 90

Going ahead to step 6:
When dividing 385 by 90, we get 4 with a remainder of 25.
The next digit of our result is 4. 
Result so far: 6344.0
If we take 360 away from 385, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 7:
When dividing 250 by 90, we get 2 with a remainder of 70.
Record the quotient 2 as the next digit in the result. 
Result so far: 6344.2
Deduct 180 from 250 and we're left 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.

Going ahead to step 8:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 6344.27
Deduct 630 from 700 and we're left 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.

Let's proceed to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 6344.277
If we subtract 630 from 700, we 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.

After the division, we end up with 6344.277 and a remainder of 0.007.