79916 divided by 90 
The aim is to understand the frequency of 90 in 79916.

Moving on to step 1:
7 divided by 90 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 90

Step 2:
When dividing 79 by 90, we get 0 with a remainder of 79.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 79 and we're left with 79.
Grab the next digit (9) from the dividend, add it to 79, then carry on: 799 / 90

Advancing to step 3:
90 goes into 799 8 times with a remainder of 79.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 720 from 799, we get 79.
Take the next digit (1) from the dividend and append it to 79, then repeat: 791 / 90

Going ahead to step 4:
90 can be fit into 791 8 times, resulting in a remainder of 71.
Use 8 as the next digit of our solution. 
Result so far: 88.0
If we take 720 away from 791, we end up with 71.
Append the next digit (6) from the dividend to 71 and continue with: 716 / 90

Moving on to step 5:
If we divide 716 by 90, we get 7 and a remainder of 86.
Use 7 as the next digit of our solution. 
Result so far: 887.0
Subtract 630 from 716 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 6:
860 divided by 90 is 9 with a remainder of 50.
The number 9 becomes the next digit in our result. 
Result so far: 887.9
Deduct 810 from 860 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 7:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 887.95
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
90 goes into 500 5 times with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 887.955
The remainder is 50 after subtracting 450 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final outcome is 887.955, with a leftover of 0.005.