We look at the division of 79247 by 90 
The aim is to understand the frequency of 90 in 79247.

On to step 1:
When dividing 7 by 90, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 90

Advancing to step 2:
If we divide 79 by 90, we get 0 and a remainder of 79.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 79 leaves us with 79.
Fetch the next digit (2) from the dividend, attach it to 79 and continue: 792 / 90

Moving on to step 3:
The number 90 fits into 792 8 times, leaving a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 72 after subtracting 720 from 792.
Grab the next digit (4) from the dividend, add it to 72, then carry on: 724 / 90

Going ahead to step 4:
When dividing 724 by 90, we get 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 88.0
If we take 720 away from 724, we end up with 4.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 90

Let's proceed to step 5:
If we divide 47 by 90, we get 0 and a remainder of 47.
The next digit of our result is 0. 
Result so far: 880.0
Deduct 0 from 47 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 6:
90 can be fit into 470 5 times, resulting in a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 880.5
Subtracting 450 from 470 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
90 can be fit into 200 2 times, resulting in a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 880.52
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 880.522
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 880.522 with a remainder of 0.002.