We divide 259742 by 90
The aim is to understand the frequency of 90 in 259742.

On to step 1:
2 divided by 90 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 90

Let's proceed to step 2:
The number 90 fits into 25 0 times, leaving a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Fetch the next digit (9) from the dividend, attach it to 25 and continue: 259 / 90

Step 3:
The number 90 fits into 259 2 times, leaving a remainder of 79.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 180 away from 259, we end up with 79.
Take the next digit (7) from the dividend and append it to 79, then repeat: 797 / 90

Moving on to step 4:
If we divide 797 by 90, we get 8 and a remainder of 77.
Write down 8 as next digit of the result. 
Result so far: 28.0
Deduct 720 from 797 and we're left with 77.
Append the next digit (4) from the dividend to 77 and continue with: 774 / 90

Advancing to step 5:
The number 90 fits into 774 8 times, leaving a remainder of 54.
Put 8 as the next digit of the answer. 
Result so far: 288.0
Subtract 720 from 774 to get 54.
Grab the next digit (2) from the dividend, add it to 54, then carry on: 542 / 90

Moving on to step 6:
When dividing 542 by 90, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 2886.0
If we subtract 540 from 542, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
90 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 2886.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 8:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 2886.02
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
If we divide 200 by 90, we get 2 and a remainder of 20.
The next digit of our result is 2. 
Result so far: 2886.022
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 2886.022, with a leftover of 0.002.