Let's divide 136519 by 90
The aim is to understand the frequency of 90 in 136519.

Moving on to step 1:
1 divided by 90 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 90

Advancing to step 2:
13 divided by 90 is 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 90

Let's proceed to step 3:
If we divide 136 by 90, we get 1 and a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 46 after subtracting 90 from 136.
Bring next digit (5) of the dividend behind the 46 and repeat the process: 465 / 90

Going ahead to step 4:
When dividing 465 by 90, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 15 after subtracting 450 from 465.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 90

On to step 5:
If we divide 151 by 90, we get 1 and a remainder of 61.
Put 1 as the next digit of the answer. 
Result so far: 151.0
If we take 90 away from 151, we end up with 61.
Append the next digit (9) from the dividend to 61 and continue with: 619 / 90

Advancing to step 6:
90 goes into 619 6 times with a remainder of 79.
The number 6 becomes the next digit in our result. 
Result so far: 1516.0
Subtract 540 from 619 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 7:
90 goes into 790 8 times with a remainder of 70.
Record the quotient 8 as the next digit in the result. 
Result so far: 1516.8
Subtracting 720 from 790 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
The next digit of our result is 7. 
Result so far: 1516.87
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 1516.877
Deduct 630 from 700 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

In conclusion, the division gives 1516.877 with a balance of 0.007.