We look at the division of 319986 by 90 
The aim is to understand the frequency of 90 in 319986.

On to step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 90

Let's proceed to step 2:
The number 90 fits into 31 0 times, leaving a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Bring next digit (9) of the dividend behind the 31 and repeat the process: 319 / 90

Advancing to step 3:
90 goes into 319 3 times with a remainder of 49.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 49 after subtracting 270 from 319.
Bring next digit (9) of the dividend behind the 49 and repeat the process: 499 / 90

Going ahead to step 4:
If we divide 499 by 90, we get 5 and a remainder of 49.
Write down 5 as next digit of the result. 
Result so far: 35.0
The remainder is 49 after subtracting 450 from 499.
Fetch the next digit (8) from the dividend, attach it to 49 and continue: 498 / 90

Step 5:
90 goes into 498 5 times with a remainder of 48.
Record the quotient 5 as the next digit in the result. 
Result so far: 355.0
Subtracting 450 from 498 leaves us with 48.
Fetch the next digit (6) from the dividend, attach it to 48 and continue: 486 / 90

Moving on to step 6:
If we divide 486 by 90, we get 5 and a remainder of 36.
Put 5 as the next digit of the answer. 
Result so far: 3555.0
Deduct 450 from 486 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 7:
360 divided by 90 is 4 with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 3555.4
If we subtract 360 from 360, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
90 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 3555.4
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 90 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 3555.4
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 3555.4 with a balance of 0.0.