Let's divide 177993 by 90
The aim is to understand the frequency of 90 in 177993.

Let's proceed to step 1:
When dividing 1 by 90, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 90

Step 2:
If we divide 17 by 90, we get 0 and a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Append the next digit (7) from the dividend to 17 and continue with: 177 / 90

Going ahead to step 3:
90 can be fit into 177 1 times, resulting in a remainder of 87.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 90 from 177 to get 87.
Grab the next digit (9) from the dividend, add it to 87, then carry on: 879 / 90

Moving on to step 4:
90 goes into 879 9 times with a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 19.0
The remainder is 69 after subtracting 810 from 879.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 90

Going ahead to step 5:
90 can be fit into 699 7 times, resulting in a remainder of 69.
The number 7 becomes the next digit in our result. 
Result so far: 197.0
Deduct 630 from 699 and we're left with 69.
Bring next digit (3) of the dividend behind the 69 and repeat the process: 693 / 90

Going ahead to step 6:
90 goes into 693 7 times with a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 1977.0
Deduct 630 from 693 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 7:
When dividing 630 by 90, we get 7 with a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 1977.7
Subtracting 630 from 630 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
90 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1977.7
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
The number 90 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1977.7
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1977.7, and the remainder is 0.0.