64050 ÷ 90 
The aim is to understand the frequency of 90 in 64050.

Going ahead to step 1:
If we divide 6 by 90, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 90

Let's proceed to step 2:
When dividing 64 by 90, we get 0 with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 90

Let's proceed to step 3:
When dividing 640 by 90, we get 7 with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 7.0
The remainder is 10 after subtracting 630 from 640.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 90

Going ahead to step 4:
The number 90 fits into 105 1 times, leaving a remainder of 15.
The next digit of our result is 1. 
Result so far: 71.0
Subtract 90 from 105 to get 15.
Fetch the next digit (0) from the dividend, attach it to 15 and continue: 150 / 90

Step 5:
The number 90 fits into 150 1 times, leaving a remainder of 60.
Put 1 as the next digit of the answer. 
Result so far: 711.0
Subtract 90 from 150 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 6:
The number 90 fits into 600 6 times, leaving a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 711.6
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 7:
600 divided by 90 is 6 with a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 711.66
Subtracting 540 from 600 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 711.66 with a remainder of 0.06.