Let's divide 31315 by 90
The aim is to understand the frequency of 90 in 31315.

Moving on to step 1:
90 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 90

Step 2:
31 divided by 90 is 0 with a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Fetch the next digit (3) from the dividend, attach it to 31 and continue: 313 / 90

Moving on to step 3:
90 goes into 313 3 times with a remainder of 43.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 270 from 313 and we're left with 43.
Include the next digit (1) from the dividend after 43, then repeat: 431 / 90

Moving on to step 4:
When dividing 431 by 90, we get 4 with a remainder of 71.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Subtracting 360 from 431 leaves us with 71.
Fetch the next digit (5) from the dividend, attach it to 71 and continue: 715 / 90

Going ahead to step 5:
90 goes into 715 7 times with a remainder of 85.
Use 7 as the next digit of our solution. 
Result so far: 347.0
Subtracting 630 from 715 leaves us with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Moving on to step 6:
90 can be fit into 850 9 times, resulting in a remainder of 40.
Put 9 as the next digit of the answer. 
Result so far: 347.9
The remainder is 40 after subtracting 810 from 850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 7:
If we divide 400 by 90, we get 4 and a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 347.94
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
90 can be fit into 400 4 times, resulting in a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 347.944
Subtracting 360 from 400 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 347.944, with a leftover of 0.004.