21119 ÷ 90 
The aim is to understand the frequency of 90 in 21119.

Let's proceed to step 1:
2 divided by 90 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 90

On to step 2:
If we divide 21 by 90, we get 0 and a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 90

On to step 3:
90 goes into 211 2 times with a remainder of 31.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 180 from 211, we get 31.
Grab the next digit (1) from the dividend, add it to 31, then carry on: 311 / 90

Let's proceed to step 4:
90 goes into 311 3 times with a remainder of 41.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Deduct 270 from 311 and we're left with 41.
Fetch the next digit (9) from the dividend, attach it to 41 and continue: 419 / 90

Let's proceed to step 5:
419 divided by 90 is 4 with a remainder of 59.
The number 4 becomes the next digit in our result. 
Result so far: 234.0
Subtract 360 from 419 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 6:
90 goes into 590 6 times with a remainder of 50.
Use 6 as the next digit of our solution. 
Result so far: 234.6
The remainder is 50 after subtracting 540 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 7:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 234.65
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 8:
If we divide 500 by 90, we get 5 and a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 234.655
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

In conclusion, the division gives 234.655 with a balance of 0.005.