613773 ÷ 90 
The aim is to understand the frequency of 90 in 613773.

Advancing to step 1:
90 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 90

Advancing to step 2:
If we divide 61 by 90, we get 0 and a remainder of 61.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 61, we get 61.
Append the next digit (3) from the dividend to 61 and continue with: 613 / 90

Going ahead to step 3:
When dividing 613 by 90, we get 6 with a remainder of 73.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 540 from 613 to get 73.
Append the next digit (7) from the dividend to 73 and continue with: 737 / 90

Going ahead to step 4:
If we divide 737 by 90, we get 8 and a remainder of 17.
Write down 8 as next digit of the result. 
Result so far: 68.0
The remainder is 17 after subtracting 720 from 737.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 90

Going ahead to step 5:
90 goes into 177 1 times with a remainder of 87.
The number 1 becomes the next digit in our result. 
Result so far: 681.0
The remainder is 87 after subtracting 90 from 177.
Grab the next digit (3) from the dividend, add it to 87, then carry on: 873 / 90

Advancing to step 6:
90 goes into 873 9 times with a remainder of 63.
Write down 9 as next digit of the result. 
Result so far: 6819.0
Subtracting 810 from 873 leaves us 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.

Let's proceed to step 7:
90 can be fit into 630 7 times, resulting in a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 6819.7
Subtract 630 from 630 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.

Step 8:
The number 90 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6819.7
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.

Moving on to step 9:
The number 90 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6819.7
Subtracting 0 from 0 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.

The quotient of the division is 6819.7, and the remainder is 0.0.