We look at the division of 738446 by 90 
The aim is to understand the frequency of 90 in 738446.

Let's proceed to step 1:
If we divide 7 by 90, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 90

Advancing to step 2:
If we divide 73 by 90, we get 0 and a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 73 leaves us with 73.
Fetch the next digit (8) from the dividend, attach it to 73 and continue: 738 / 90

Let's proceed to step 3:
738 divided by 90 is 8 with a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 720 from 738 to get 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 90

On to step 4:
184 divided by 90 is 2 with a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 82.0
Deduct 180 from 184 and we're left with 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 90

Moving on to step 5:
90 goes into 44 0 times with a remainder of 44.
The next digit of our result is 0. 
Result so far: 820.0
If we subtract 0 from 44, we get 44.
Take the next digit (6) from the dividend and append it to 44, then repeat: 446 / 90

Let's proceed to step 6:
When dividing 446 by 90, we get 4 with a remainder of 86.
Use 4 as the next digit of our solution. 
Result so far: 8204.0
If we subtract 360 from 446, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Step 7:
860 divided by 90 is 9 with a remainder of 50.
Use 9 as the next digit of our solution. 
Result so far: 8204.9
Deduct 810 from 860 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.

Advancing to step 8:
When dividing 500 by 90, we get 5 with a remainder of 50.
The next digit of our result is 5. 
Result so far: 8204.95
The remainder is 50 after subtracting 450 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 8204.955
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The quotient of the division is 8204.955, and the remainder is 0.005.