65880837 divided by 90 
The aim is to understand the frequency of 90 in 65880837.

Going ahead to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 90

Step 2:
If we divide 65 by 90, we get 0 and a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 65, we get 65.
Fetch the next digit (8) from the dividend, attach it to 65 and continue: 658 / 90

Going ahead to step 3:
90 goes into 658 7 times with a remainder of 28.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 630 from 658, we get 28.
Include the next digit (8) from the dividend after 28, then repeat: 288 / 90

Let's proceed to step 4:
If we divide 288 by 90, we get 3 and a remainder of 18.
The next digit of our result is 3. 
Result so far: 73.0
Subtract 270 from 288 to get 18.
Take the next digit (0) from the dividend and append it to 18, then repeat: 180 / 90

Moving on to step 5:
When dividing 180 by 90, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 732.0
Subtract 180 from 180 to get 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 90

Going ahead to step 6:
If we divide 8 by 90, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 7320.0
Subtract 0 from 8 to get 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 90

Moving on to step 7:
When dividing 83 by 90, we get 0 with a remainder of 83.
The next digit of our result is 0. 
Result so far: 73200.0
If we subtract 0 from 83, we get 83.
Fetch the next digit (7) from the dividend, attach it to 83 and continue: 837 / 90

On to step 8:
837 divided by 90 is 9 with a remainder of 27.
Record the quotient 9 as the next digit in the result. 
Result so far: 732009.0
Deduct 810 from 837 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 9:
The number 90 fits into 270 3 times, leaving a remainder of 0.
The next digit of our result is 3. 
Result so far: 732009.3
Subtract 270 from 270 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 10:
If we divide 0 by 90, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 732009.3
If we subtract 0 from 0, we 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.

On to step 11:
If we divide 0 by 90, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 732009.3
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 732009.3, and the remainder is 0.0.