Let's divide 773977 by 90
The aim is to understand the frequency of 90 in 773977.

Let's proceed 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
Subtract 0 from 7 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 90

Let's proceed to step 2:
The number 90 fits into 77 0 times, leaving a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Append the next digit (3) from the dividend to 77 and continue with: 773 / 90

Moving on to step 3:
90 goes into 773 8 times with a remainder of 53.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 720 from 773 and we're left with 53.
Bring next digit (9) of the dividend behind the 53 and repeat the process: 539 / 90

Advancing to step 4:
When dividing 539 by 90, we get 5 with a remainder of 89.
Put 5 as the next digit of the answer. 
Result so far: 85.0
If we take 450 away from 539, we end up with 89.
Take the next digit (7) from the dividend and append it to 89, then repeat: 897 / 90

Let's proceed to step 5:
If we divide 897 by 90, we get 9 and a remainder of 87.
Write down 9 as next digit of the result. 
Result so far: 859.0
Subtracting 810 from 897 leaves us with 87.
Include the next digit (7) from the dividend after 87, then repeat: 877 / 90

On to step 6:
If we divide 877 by 90, we get 9 and a remainder of 67.
Use 9 as the next digit of our solution. 
Result so far: 8599.0
If we take 810 away from 877, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 7:
The number 90 fits into 670 7 times, leaving a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 8599.7
Subtracting 630 from 670 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
When dividing 400 by 90, we get 4 with a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 8599.74
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
When dividing 400 by 90, we get 4 with a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 8599.744
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 8599.744 and a remainder of 0.004.