Let's divide 537213 by 90
The aim is to understand the frequency of 90 in 537213.

Let's proceed to step 1:
5 divided by 90 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 90

Let's proceed to step 2:
If we divide 53 by 90, we get 0 and a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Include the next digit (7) from the dividend after 53, then repeat: 537 / 90

Step 3:
90 can be fit into 537 5 times, resulting in a remainder of 87.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 87 after subtracting 450 from 537.
Include the next digit (2) from the dividend after 87, then repeat: 872 / 90

Step 4:
90 goes into 872 9 times with a remainder of 62.
Write down 9 as next digit of the result. 
Result so far: 59.0
If we subtract 810 from 872, we get 62.
Grab the next digit (1) from the dividend, add it to 62, then carry on: 621 / 90

Moving on to step 5:
The number 90 fits into 621 6 times, leaving a remainder of 81.
The number 6 becomes the next digit in our result. 
Result so far: 596.0
If we subtract 540 from 621, we get 81.
Append the next digit (3) from the dividend to 81 and continue with: 813 / 90

On to step 6:
90 can be fit into 813 9 times, resulting in a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 5969.0
Subtract 810 from 813 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
When dividing 30 by 90, we get 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 5969.0
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
When dividing 300 by 90, we get 3 with a remainder of 30.
The next digit of our result is 3. 
Result so far: 5969.03
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
When dividing 300 by 90, we get 3 with a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 5969.033
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

In conclusion, the division gives 5969.033 with a balance of 0.003.