We divide 793996 by 90
The aim is to understand the frequency of 90 in 793996.

Advancing to step 1:
When dividing 7 by 90, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 90

Step 2:
If we divide 79 by 90, we get 0 and a remainder of 79.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 79 leaves us with 79.
Append the next digit (3) from the dividend to 79 and continue with: 793 / 90

On to step 3:
When dividing 793 by 90, we get 8 with a remainder of 73.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 720 from 793 leaves us with 73.
Fetch the next digit (9) from the dividend, attach it to 73 and continue: 739 / 90

On to step 4:
The number 90 fits into 739 8 times, leaving a remainder of 19.
The number 8 becomes the next digit in our result. 
Result so far: 88.0
Subtracting 720 from 739 leaves us with 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 90

Step 5:
90 goes into 199 2 times with a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 882.0
If we subtract 180 from 199, we get 19.
Bring next digit (6) of the dividend behind the 19 and repeat the process: 196 / 90

Advancing to step 6:
When dividing 196 by 90, we get 2 with a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 8822.0
If we take 180 away from 196, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
If we divide 160 by 90, we get 1 and a remainder of 70.
Write down 1 as next digit of the result. 
Result so far: 8822.1
Deduct 90 from 160 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.

Advancing to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 8822.17
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:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 8822.177
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The quotient of the division is 8822.177, and the remainder is 0.007.