579814 ÷ 90 
The aim is to understand the frequency of 90 in 579814.

Moving on to step 1:
90 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 90

Step 2:
When dividing 57 by 90, we get 0 with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Take the next digit (9) from the dividend and append it to 57, then repeat: 579 / 90

Going ahead to step 3:
90 can be fit into 579 6 times, resulting in a remainder of 39.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 540 from 579 leaves us with 39.
Take the next digit (8) from the dividend and append it to 39, then repeat: 398 / 90

Advancing to step 4:
When dividing 398 by 90, we get 4 with a remainder of 38.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Subtracting 360 from 398 leaves us with 38.
Grab the next digit (1) from the dividend, add it to 38, then carry on: 381 / 90

On to step 5:
When dividing 381 by 90, we get 4 with a remainder of 21.
Put 4 as the next digit of the answer. 
Result so far: 644.0
Subtracting 360 from 381 leaves us with 21.
Fetch the next digit (4) from the dividend, attach it to 21 and continue: 214 / 90

Step 6:
214 divided by 90 is 2 with a remainder of 34.
The next digit of our result is 2. 
Result so far: 6442.0
Deduct 180 from 214 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 7:
The number 90 fits into 340 3 times, leaving a remainder of 70.
Put 3 as the next digit of the answer. 
Result so far: 6442.3
Deduct 270 from 340 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 8:
90 goes into 700 7 times with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 6442.37
Subtracting 630 from 700 leaves us 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.

Moving on to step 9:
700 divided by 90 is 7 with a remainder of 70.
The next digit of our result is 7. 
Result so far: 6442.377
If we take 630 away from 700, we end up 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.

After the division, we end up with 6442.377 and a remainder of 0.007.