We look at the division of 8374 by 90 
The aim is to understand the frequency of 90 in 8374.

Moving on to step 1:
The number 90 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 90

On to step 2:
When dividing 83 by 90, we get 0 with a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Fetch the next digit (7) from the dividend, attach it to 83 and continue: 837 / 90

Moving on to step 3:
90 can be fit into 837 9 times, resulting in a remainder of 27.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 810 from 837 leaves us with 27.
Fetch the next digit (4) from the dividend, attach it to 27 and continue: 274 / 90

Step 4:
The number 90 fits into 274 3 times, leaving a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 93.0
If we take 270 away from 274, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 5:
90 goes into 40 0 times with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 93.0
Subtracting 0 from 40 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.

Moving on to step 6:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 93.04
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.

Advancing to step 7:
90 goes into 400 4 times with a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 93.044
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 quotient of the division is 93.044, and the remainder is 0.004.