We look at the division of 137796 by 90 
The aim is to understand the frequency of 90 in 137796.

Going ahead to step 1:
If we divide 1 by 90, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 90

Going ahead to step 2:
The number 90 fits into 13 0 times, leaving a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Append the next digit (7) from the dividend to 13 and continue with: 137 / 90

Moving on to step 3:
90 can be fit into 137 1 times, resulting in a remainder of 47.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 90 from 137 and we're left with 47.
Take the next digit (7) from the dividend and append it to 47, then repeat: 477 / 90

Let's proceed to step 4:
477 divided by 90 is 5 with a remainder of 27.
The next digit of our result is 5. 
Result so far: 15.0
Subtracting 450 from 477 leaves us with 27.
Grab the next digit (9) from the dividend, add it to 27, then carry on: 279 / 90

Moving on to step 5:
The number 90 fits into 279 3 times, leaving a remainder of 9.
The next digit of our result is 3. 
Result so far: 153.0
If we subtract 270 from 279, we get 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 90

Going ahead to step 6:
When dividing 96 by 90, we get 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1531.0
Subtracting 90 from 96 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
The number 90 fits into 60 0 times, leaving a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 1531.0
Subtracting 0 from 60 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.

Going ahead to step 8:
90 goes into 600 6 times with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 1531.06
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.

Step 9:
When dividing 600 by 90, we get 6 with a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 1531.066
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.

The final outcome is 1531.066, with a leftover of 0.006.