4237 divided by 90 
The aim is to understand the frequency of 90 in 4237.

Going ahead to step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 90

Let's proceed to step 2:
If we divide 42 by 90, we get 0 and a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Bring next digit (3) of the dividend behind the 42 and repeat the process: 423 / 90

Going ahead to step 3:
When dividing 423 by 90, we get 4 with a remainder of 63.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 360 from 423 and we're left with 63.
Bring next digit (7) of the dividend behind the 63 and repeat the process: 637 / 90

Let's proceed to step 4:
637 divided by 90 is 7 with a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 47.0
If we subtract 630 from 637, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 5:
When dividing 70 by 90, we get 0 with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 47.0
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 6:
If we divide 700 by 90, we get 7 and a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 47.07
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 7:
When dividing 700 by 90, we get 7 with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 47.077
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Our division results in 47.077 with a remaining 0.007.