972718 divided by 90 
The aim is to understand the frequency of 90 in 972718.

Let's proceed to step 1:
The number 90 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 90

On to step 2:
90 can be fit into 97 1 times, resulting in a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 90 from 97 and we're left with 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 90

On to step 3:
The number 90 fits into 72 0 times, leaving a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 72 after subtracting 0 from 72.
Fetch the next digit (7) from the dividend, attach it to 72 and continue: 727 / 90

Going ahead to step 4:
If we divide 727 by 90, we get 8 and a remainder of 7.
Use 8 as the next digit of our solution. 
Result so far: 108.0
If we take 720 away from 727, we end up with 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 90

Advancing to step 5:
90 goes into 71 0 times with a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 1080.0
The remainder is 71 after subtracting 0 from 71.
Take the next digit (8) from the dividend and append it to 71, then repeat: 718 / 90

Advancing to step 6:
90 can be fit into 718 7 times, resulting in a remainder of 88.
Use 7 as the next digit of our solution. 
Result so far: 10807.0
Subtracting 630 from 718 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 7:
The number 90 fits into 880 9 times, leaving a remainder of 70.
The next digit of our result is 9. 
Result so far: 10807.9
Subtract 810 from 880 to 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.

Going ahead to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 10807.97
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.

Going ahead to step 9:
700 divided by 90 is 7 with a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 10807.977
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.

The final result is 10807.977 with a remainder of 0.007.